About Yuki Nagai

English / Japanese

永井佑紀

国立研究開発法人日本原子力研究開発機構　システム計算科学センター　シミュレーション技術開発室　副主任研究員

国立研究開発法人理化学研究所　革新知能統合研究センター数理科学チーム　客員研究員

連絡先
Email: Nagai.Yuki_-at.-mark.-_jaea.go.jp ("_"で囲まれた部分を取り去ってください)

Researcher ID:

略歴

2001 私立札幌光星高校卒業

2005 北海道大学工学部応用物理学科卒業（物性物理工学分野：明楽浩史教授）

2007 東京大学大学院理学系研究科物理学専攻修士課程修了（加藤雄介助教授）

2010 東京大学大学院理学系研究科物理学専攻博士課程修了（加藤雄介准教授）

学位：博士(理学)

職歴等

2005年度夏学期：物理学B（力学）TA

2006年度冬学期：基礎物理学実験TA

2007年5月16日〜6月15日：京都大学基礎物理学研究所アトム型研究員

2007年4月〜2008年3月：理化学研究所古崎物性理論研究室JRA（ジュニア・リサーチ・アソシエイト）

2007年度冬学期：基礎物理学実験TA（回数は半分）

2008年4月〜日本学術振興会特別研究員(DC2)

2008年度冬学期：基礎物理学実験TA（回数は半分）

2009年度冬学期：基礎物理学実験TA（回数は半分）

2009年度冬学期：英語ALESS Program 実験相談会TA

2016年11月〜2017年10月：客員研究員（Visiting Scholar), Department of Physics, Massachusetts Institute of Technology, USA (Host reseacher: Prof. Liang Fu)

2010年4月〜2019年6月：国立研究開発法人日本原子力研究開発機構　システム計算科学センター　シミュレーション技術開発室　研究員

2019年7月〜：現職

2018年8月〜：国立研究開発法人理化学研究所　革新知能統合研究センター数理科学チーム　客員研究員

2019年4月〜2020年3月：学習院大学物理学科　非常勤講師　（担当講義:　熱学および統計力学２　物３年（第一学期）　および　熱学および統計力学３　物３年 (第二学期)）

専門
物性理論、特に固体物理

受賞等
2015年3月: 第９回(2015年)日本物理学会若手奨励賞受賞(領域6)
[LINK]
2018年10月: 日本原子力研究開発機構　理事長表彰　研究開発功績賞

これまでやってきたこと。括弧内は主な共同研究者
量子Hall系(2004年)：
整数量子Hall系のホールバーの電子流体解析（北大工明楽教授）
超伝導の準古典理論による研究(2005年~)（東大総合文化加藤准教授、阪府大林講師）：
渦糸電子状態（走査型トンネル顕微鏡実験の解析）、磁場回転比熱・熱伝導率の解析
多軌道系超伝導体（鉄系超伝導体）の現象論(2009年~)（東大総合文化加藤准教授、阪府大林講師、東大理青木教授、電通大黒木教授、原子力機構町田氏）：
NMRによる核磁気緩和率の解析、超流動密度の解析、界面束縛状態、渦糸近傍の準粒子干渉効果の理論、不純物による転移温度の減少の解析、中性子散乱実験の多軌道乱雑位相近似による解析
トポロジカル絶縁体の電子物性(2008年~2009年)（理研古崎氏）：
スピン軌道相互作用を入れたダイヤモンド型格子の強束縛模型のAnderson転移の転送行列法による解析（残念ながら結果出ず）
超固体(2009年~)（東大総合文化加藤准教授、國見氏）：
一次元有限距離グロスピタエフスキー方程式によるジョセフソン効果
グラフェンナノリボンの電子物性(2008年~2009年)（東大総合文化吉岡教授、中倉氏）：
再帰的Green関数法によるグラフェンナノリボンの電子物性の計算
超伝導グラフェンの超伝導渦糸状態(2009年~2010年)（東大総合文化加藤准教授、根本氏）：
Dirac-Bogoliubov-de Gennes方程式による解析計算と数値計算

これからやりたいこと、興味のあること。
上に述べた研究の発展的内容、動的平均場理論、連続時間量子モンテカルロ法、平均場方程式の直交多項式展開による解法、トポロジカル絶縁体、グラフェン、機械学習と物理学

著書

1. 永井佑紀 (著), 涌井貞美 (著), 現代用語の基礎知識 (編さん)

理科のおさらい物理 (おとなの楽習 5
自由国民社
[Amazon]

2. 門脇和男（編)

超伝導磁束状態の物理
裳華房
2章6.5節「BdG方程式による非一様な多バンド超伝導の理論」を執筆。
[Amazon]

3. 橋本幸士 (著), 大槻東巳 (著), 真野智裕 (著), 斎藤弘樹 (著), 藤田浩之 (著), 安藤康伸 (著), 永井佑紀 (著), 青木健一 (著), 藤田達大 (著), 小林玉青 (著), 大関真之 (著), 久良尚任 (著), 福嶋健二 (著), 村瀬功一 (著), 船井正太郎 (著), 柏浩司 (著), 富谷昭夫 (著), 橋本幸士 (編集)

物理学者,機械学習を使うー機械学習・深層学習の物理学への応用ー
朝倉書店
第5章「自己学習モンテカルロ法」を執筆。
[Amazon]

原著論文

それぞれの論文の簡単な日本語解説はこちら

59. Hiroshi Shinaoka and Yuki Nagai

Sparse modeling of large-scale quantum impurity models with low symmetries
arXiv:2007.03955

58. Hidehiko Kohshiro and Yuki Nagai

Effective Ruderman-Kittel-Kasuya-Yosida-like interaction in diluted double-exchange model: self-learning Monte Carlo approach
arXiv:2005.06992

57. Yuki Nagai, Yang Qi, Hiroki Isobe, Vladyslav Kozii, andLiang Fu

DMFT reveals the non-Hermitian topology in heavy-fermion systems
arXiv:2005.06729

56. Taiki Matsushita, Yuki Nagai, and Satoshi Fujimoto

Spectrum collapse of disordered Dirac Landau levels as non-Hermitian topological phase transition
arXiv:2004.11014

55. Etsuko Itou and Y. Nagai

Sparse modeling approach to obtaining the shear viscosity from smeared correlation functions
Journal of High Energy Physics 2020, 7 (2020). [link]
arXiv:2004.02426

54. Majid Kheirkhah, Zhongbo Yan, Yuki Nagai, Frank Marsiglio

First and second-order topological superconductivity and temperature-driven topological phase transitions in the extended Hubbard model with spin-orbit coupling
Phys. Rev. Lett. 125, 017001 (2020). [link]
arXiv:2001.08739

53. Y. Nagai

N-independent Localized Krylov Bogoliubov-de Gennes Method: Ultra-fast Numerical Approach to Large-scale Inhomogeneous Superconductors
J. Phys. Soc. Jpn. 89, 074703 (2020). [link]
arXiv:2001.02362

52. K. Iida, Y. Nagai, S. Ishida, M. Ishikado, N. Murai, A. D. Christianson, H. Yoshida, Y. Inamura, H. Nakamura, A. Nakao, K. Munakata, D. Kagerbauer, M. Eisterer, K. Kawashima, Y. Yoshida, H. Eisaki, and A. Iyo

Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4
Phys. Rev. B 100, 014506 (2019). [link]
arXiv:1907.03839

51. T. Matsushita, Y Nagai and S. Fujimoto

Disorder-induced exceptional and hybrid rings in Weyl/Dirac semimetals
Phys. Rev. B 100, 245205 (2019) [link]
arXiv:1908.03345

50. Yuki Nagai and Yusuke Kato

Quasiparticle Bound States around Fractional Vortices in s-wave Superconductor
J. Phys. Soc. Jpn. 88, 054707 (2019). [link]
arXiv:1812.03646

49. Majid Kheirkhah, Yuki Nagai, Chun Chen, Frank Marsiglio

Majorana corner flat bands in two-dimensional second-order topological superconductors
Phys. Rev. B 101, 104502 (2020). [link]
arXiv:1904.00990

48. Yuki Nagai, Masahiko Okumura, and Akinori Tanaka

Self-learning Monte Carlo method with Behler-Parrinello neural networks
Phys. Rev. B 101, 115111 (2020). [link]
arXiv:1807.04955

47. Yuki Nagai and Hiroshi Shinaoka

Smooth self-energy in the exact-diagonalization-based dynamical mean-field theory: Intermediate-representation filtering approach
J. Phys. Soc. Jpn. 88, 064004 (2019). [link]
arXiv:1806.10316

46. K. Iida, M. Ishikado, Y. Nagai, H. Yoshida, A. D. Christianson, N. Murai, K. Kawashima, Y. Yoshida, H. Eisaki, A. Iyo

Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
J. Phys. Soc. Jpn. 86, 093703 (2017). [link]
arXiv:1708.01006

45. Yuki Nagai, Huitao Shen, Yang Qi, Junwei Liu, and Liang Fu

Self-Learning Monte Carlo Method: Continuous-Time Algorithm
Phys. Rev. B 96, 161102(R) (2017). [link] Editors' Suggestion and Open Access
arXiv:1705.06724

44. S. L. Goertzen, K. Tanaka, and Y. Nagai

Self-consistent study of Abelian and non-Abelian order in a two-dimensional topological superconductor
Phys. Rev. B 95, 064509 (2017) [link]
arXiv:1611.01610

43. Y. Nagai, Yukihiro Ota, and K. Tanaka

Time-reversal symmetry breaking and gapped surface states due to spontaneous emergence of new order in d-wave nanoislands
Phys. Rev. B 96, 060503(R) (2016) [link]
arXiv:1610.05501

42. Howon Kim, Shi-Zeng Lin, Matthias J. Graf, Yoshinori Miyata, Yuki Nagai, Takeo Kato, and Yukio Hasegawa

Electrical Conductivity through a Single Atomic Step Measured with the Proximity-Induced Superconducting Pair Correlation
Phys. Rev. Lett 117, 116802 (2016). [link]

41. Y. Nagai, Yasushi Shinohara, Yasunori Futamura, and Tetsuya Sakurai

Reduced-Shifted Conjugate-Gradient Method for a Green's Function: Efficient Numerical Approach in a Nano-structured Superconductor
J. Phys. Soc. Jpn. 86, 014708 (2017) [link]
arXiv:1607.03992
The sample code is available.[Sample code]

40. Shingo Yonezawa, Kengo Tajiri, Suguru Nakata, Yuki Nagai, Zhiwei Wang, Koji Segawa, Yoichi Ando, and Yoshiteru Maeno

Thermodynamic evidence for nematic superconductivity in CuxBi2Se3
Nature Physics 13, 123 (2017) [link]
arXiv:1602.08941

39. Evan D. B. Smith, K. Tanaka, and Y. Nagai

Manifestation of chirality in the vortex lattice in a two-dimensional topological superconductor
Phys. Rev. B 94, 064515 (2016). [link]
arXiv:1605.08934

38. Y. Nagai and Y. Ota

Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
Phys. Rev. B 94, 134516 (2016). [link]
arXiv:1605.08164

37. Yuki Nagai, Shintaro Hoshino, and Yukihiro Ota

Critical Temperature Enhancement of Topological Superconductors: A Dynamical Mean Field Study
Phys. Rev. B 93, 220505(R) (2016). [link]
arXiv:1602.06087

36. Yoichi Higashi, Yuki Nagai, Tomohiro Yoshida, Yusuke Masaki, and Youichi Yanase

Robust zero-energy bound states around a pair-density-wave vortex core in locally noncentrosymmetric superconductors
Phys. Rev. B 93, 104529 (2016). [link]
arXiv:1602.00425

35. A. Shitade and Y. Nagai

Orbital angular momentum in a topological superconductor with Chern number higher than 1
Phys. Rev. B 93, 174517 (2016). [link]
arXiv:1512.07997

34. Y. Nagai, and H. Nakamura

Multi-band Eilenberger theory of superconductivity: Systematic low-energy projection
J. Phys. Soc. Jpn. 85, 074707 (2016). [link]
arXiv:1507.06039

33. Y. Nagai, H. Nakamura, M. Machida, and K. Kuroki

First-principle study of antimony doping effects on the iron-based superconductor CaFe(Sb$_{x}$As$_{1-x}$)$_{2}$
J. Phys. Soc. Jpn. 84, 093702 (2015). [link]
arXiv:1506.08515

32. Y. Nagai, Y. Ota, and M. Machida

Inverse coherence effects in nuclear magnetic relaxation rates as a sign of topological superconductivity
Phys. Rev. B 92, 180502(R) (2015). [link]
arXiv:1504.08095

31. A. Shitade and Y. Nagai

Orbital angular momentum in a nonchiral topological superconductor
Phys. Rev. B 92, 024502 (2015). [link]
arXiv:1501.06677

30. Y. Nagai, H. Nakamura, M. Machida

Surface states around a vortex in topological superconductors: Intersection of a surface and a vortex
J. Phys. Soc. Jpn. 84, 033703 (2015). [link]
arXiv:1412.5713

29. Y. Nagai

Robust superconductivity with nodes in the superconducting topological insulator CuxBi2Se3: Zeeman orbital field and non-magnetic impurities
Phys. Rev. B 91, 060502(R) (2015). [link]
arXiv:1410.4646

28. Y. Nagai, Y. Ota, and M. Machida

Topological s-wave pairing superconductivity with spatial inhomogeneity: Mid-gap-state appearance and Anderson's theorem
J. Phys. Soc. Jpn. 84, 034711 (2015). [link]
arXiv:1407.1125

27. S. Yoshizawa, H. Kim, T. Kawakami, Y. Nagai, T. Nakayama, X. Hu, Y. Hasegawa, and T. Uchihashi

Direct Observation of Josephson Vortices on the Surface Superconductor Si(111)-(root7xroot3)-In by Scanning Tunneling Microscopy
Phys. Rev. Lett. 113, 247004. [link] Featured in Physics and Editors' Suggestion
"Ultrathin Superconductors Take a Step Up"
arXiv:1405.5953

26. Y. Nagai

Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3
J. Phys. Soc. Jpn. 83 (2014) 063705. [link]
arXiv:1404.6874

25. Y. Nagai, Y. Ota, and M. Machida

From p- to s-wave behaviors in a three-dimensional topological superconductor with non-magnetic impurities
Phys. Rev. B 89, 214506 (2014) 214506. [link]
arXiv:1404.1662

24. Y. Nagai, Y. Ota, and M. Machida

Impurity effects in a two-dimensional topological superconductor: A link of Tc-robustness with a topological number
J. Phys. Soc. Jpn. 83 (2014) 094722. [link]
arXiv:1312.3065

23. Y. Nagai, H. Nakamura, M. Machida

Quasiclassical Treatment and Odd-parity/Triplet Correspondence in Topological Superconductors
J. Phys. Soc. Jpn. 83 (2014) 053705. [link]
arXiv:1305.3025

22. Y. Higashi, Y. Nagai, M. Machida, N. Hayashi

Field-angle Resolved Flux-flow Resistivity as a Phase-sensitive Probe of Unconventional Cooper Pairing
Phys. Rev. B 88 (2013) 224511. [link]
arXiv:1304.6509

21. Y. Nagai, Yasushi Shinohara, Yasunori Futamura, Yukihiro Ota, and Tetsuya Sakurai

Numerical construction of a low-energy effective Hamiltonian in a self-consistent Bogoliubov-de Gennes approach of superconductivity
J. Phys. Soc. Jpn. 82 (2013) 094701. [link]
arXiv:1303.3683

20. Y. Nagai, H. Nakamura, and M. Machida

Spin-polarized Majorana Bound States around a Vortex in Topological Superconductors
J. Phys. Soc. Jpn. 83 (2014) 064703. [link] Papers of Editors' Choice
"Hunting Majorana Fermions in Topological Superconductors" in JPSJ News and Comments
arXiv:1211.0125

19. Y. Nagai, H. Nakamura, and M. Machida

Rotational Isotropy Breaking as Proof for Spin-polarized Cooper Pair in Topological Superconductor CuxBi2Se3
Phys. Rev. B 86 (2012) 094507. [link]
arXiv:1206.0563

18. Y. Nagai, K. Tanaka, and N. Hayashi

Quasiclassical numerical method for mesoscopic superconductors: bound states in a circular d-wave island with a single vortex
Phys. Rev. B 86 (2012) 094526. [link]
arXiv:1202.2661

17. Y. Nagai, and K. Kuroki

Q-scan-analysis of the neutron scattering in iron-based superconductors
Phys. Rev. B 85 (2012) 134521. [link]
arXiv:1201.2453

16 Y. Nagai, Y. Ota, and M. Machida

Efficient Numerical Self-consistent Mean-field Approach for Fermionic Many-body Systems by Polynomial Expansion on Spectral Density
J. Phys. Soc. Jpn. 81 (2012) 024710. [link]
arXiv:1105.4939

15 Y. Nagai, N. Nakai, and M. Machida

Direct Numerical Demonstration of Sign-preserving Quasiparticle Interference via Impurity inside Vortex Core in Unconventional Superconductors
Phys. Rev. B 85 (2012) 092505. [link]
arXiv:1103.5842

14. Y. Nagai, and K. Kuroki

Determination of the pairing state in iron-based superconductors through neutron scattering
Phys. Rev. B 83 (2011) 220516(R). [link]
arXiv:1103.0586

13. Y. Nagai, H. Nakamura, and M. Machida

Superconducting Gap Function in an Organic Superconductor (TMTSF)2ClO4 with Anion Ordering; First-principles Calculations and Quasi-classical Analyses for Angle-resolved Heat Capacity
Phys. Rev. B 83 (2011) 104523. [link]
arXiv:1101.2277

12. M. Ishikado, Y. Nagai, K. Kodama, R. Kajimoto, M. Nakamura, Y. Inamura, S. Wakimoto, H. Nakamura, M. Machida, K. Suzuki, H. Usui, K. Kuroki, A. Iyo, H. Eisaki, M. Arai, S. Shamoto

s±-like spin resonance in the iron-based nodal superconductor BaFe2(As0.65P0.35)2 observed using inelastic neutron scattering
Phys. Rev. B 84 (2011) 144517. [link]
arXiv:1011.3191

11. Y. Imai, H. Takahashi, K. Kitagawa, K. Matsubayashi, N. Nakai, Y. Nagai, Y. Uwatoko, M. Machida, A. Maeda

Microwave Surface Impedance Measurements of LiFeAs Single Crystals
J. Phys. Soc. Jpn. 80 (2011) 013704. [link]
arXiv:1009.4628

10. M. Kunimi, Y. Nagai , and Y. kato

Josephson effects in one-dimensional supersolids
Phys. Rev. B 84 (2011) 094521. [link]
arXiv:1005.3936

9. N. Nakai, H. Nakamura, Y. Ota, Y. Nagai , N. Hayashi and M. Machida

First-principles-based pm s-wave modelling for iron-based superconductors:Studies for specific heat and nuclear magnetic relaxation rate
Phys. Rev. B 82 (2010) 094501. [link]
arXiv:0909.1195

8. Y. Nagai and Y. Kato

Impurity scattering rate and coherence factor in vortex core of sign-reversing s-wave superconductors
Phys. Rev. B 82 (2010) 174507. [link]
arXiv:0908.4451

7. S. Nakakura, Y. Nagai and D. Yoshioka

Uniform current in graphene strip with zigzag edges
J. Phys. Soc. Jpn. 78 (2009) 065003. [link]
arXiv:0903.1483

6. Y. Nagai and N. Hayashi

Surface Bound States in n-band Systems with Quasiclassical Approach
Phys. Rev. B 79 (2009) 224508. [link]
arXiv:0903.1227

5. Y. Nagai, N. Hayashi, N. Nakai, H. Nakamura, M. Okumura and M. Machida

Nuclear magnetic relaxation and superfluid density in Fe-pnictide superconductors: An anisotropic \pm s-wave scenario
New J. Phys. 10 (2008) 103026. [link]
arXiv:0809.1197

4. Y. Nagai and N. Hayashi

Kramer-Pesch approximation for analyzing field-angle-resolved measurements made in unconventional superconductors: A calculation of the zero-energy density of states
Phys. Rev. Lett. 101 (2008) 097001. [link]
arXiv:0802.1579

3. Y. Nagai, Y. Kato, N. Hayashi, K. Yamauchi and H. Harima

Calculated Positions of Point Nodes in the Gap Structure of the Borocarbide Superconductor YNi2B2C
Phys. Rev. B 76, (2007) 214514. [link]
arXiv:0706.1863

2. Y. Nagai, Y. Ueno, Y. Kato and N. Hayashi

Analytical Formulation of the Local Density of States around a Vortex Core in Unconventional Superconductors
J. Phys. Soc. Jpn. 75 (2006) 104701.[link]
cond-mat/0605441

1. Y. Nagai, Y. Kato and N. Hayashi

Analytical Result on Electronic States around a Vortex Core in a Noncentrosymmetric Superconductor
J. Phys. Soc. Jpn. 75 (2006) 043706 [link]
cond-mat/0602254

Preprints in cond-mat
publicationlist.org

Comments

1. Y. Nagai and K. Kuroki

Comment on arXiv:1105.6233 entitled "Neutron-Inelastic-Scattering Peak by Dissipationless Mechanism in the s++-wave State in Iron-based Superconductors" by S. Onari and H. Kontani
arXiv:1106.2376

Proceedings

25. Y. Ota, Y. Nagai, and M. Machida

Theory of low-energy behaviors in topological s-wave pairing superconductors
Physica C. 518 5 (2015)
[link]

24. Y. Higashi, Y. Nagai, T. Yoshida, M. Kato and Y. Yanase

Excitation spectra and wave functions of quasiparticle bound states in bilayer Rashba superconductors
Physica C. 518 1 (2015)
[link]

23. T. Kawakami, Y. Nagai, S. Yoshizawa, H. Kim, Y. Hasegawa, T. Nakayama, T. Uchihashi and X. Hu

Excitation spectrum of Josephson vortices on surface superconductor
J. Phys.: Conf. Ser. 568 022022 (2014)
[link]

22. Y. Higashi, Y. Nagai, T. Yoshida, and Y. Yanase

Vortex Core Structure in Multilayered Rashba Superconductors
J. Phys.: Conf. Ser. 568 022018 (2014)
[link]

21. Y. Nagai, Y. Ota, and M. Machida,

Robustness against non-magnetic impurities in topological superconductors
J. Phys.: Conf. Ser. 568 022030 (2014)
[link]

20. Y. Nagai, H. Nakamura, and M. Machida,

Inhomogeneity Effects in Topological Superconductors
JPS Conf. Proc. 3, 015013 (2014)
[link]

19. T. Higashi, Y. Nagai, and N. Hayashi,

Impurity Effect on the Local Density of States around a Vortex in Noncentrosymmetric Superconductors
JPS Conf. Proc. 3, 015003 (2014)
[link]

18. T. Yamane, Y. Nagai, K. Tanaka, and N. Hayashi,

Impurity scattering effect on the zero-energy peak of the local density of states in a multi-quantum vortex core
Physica C 494 (2013), 128
[link]

17. Y. Nagai, H. Nakamura, and M. Machida

Surface and vortex bound states in topological superconductors
Physica C 494 (2013), 17
[link]

16. J. W. Sadowski, K. Tanaka, and Y. Nagai

Effects of band structure and electron-phonon coupling on charge density waves
Canadian Journal of Physics, 91 (2013) 487
[link]

15. Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi

Effect of Anisotropic Fermi Surface on the Flux-flow Resistivity under Rotating Magnetic Field
Physics Procedia 45 (2013) 137
[link]

14. Y. Nagai, H. Nakamura, and M. Machida

Andreev Bound-states of vortices and surfaces in topological superconductors
J. Phys.: Conf. Ser. 393 (2012) 012017
[link]

13. Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi

Effect of uniaxially anisotropic Fermi surface on the quasiparticle scattering inside a vortex core in unconventional superconductors
Physica C 484 (2013) 97
[link]

12. Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi

Phase-Sensitive Flux-Flow resistivity in Unconventional Superconductors
J. Phys.: Conf. Ser. 400, (2012) 022025
[link]

11. Y. Nagai, Y. Ota, and M. Machida

Spectral-density polynomial expansion for two-particle Green's function in BdG framework
Physics Procedia 27 (2012) 72
[link]

10. Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida

Theoretical analysis for inelastic neutron scattering on BaFe2(As1−xPx)2 by the realistic three-dimensional 10-orbital tight-binding model
J. Phys. Soc. Jpn. 80 (2011) SB021
[link]

9. Y. Higashi, Y. Nagai, M. Machida and N. Hayashi

Field-angle dependence of the quasiparticle scattering inside a vortex core in unconventional superconductors
Physica C 471 (2011) 828
[link]

8. N. Nakai, Y. Nagai, and M. Machida

Low-lying excitations induced by non-magnetic impurities in d-wave superconductors
Physica C 471 (2011) 743
[link]

7. N. Nakai, H. Nakamura, Y. Ota, Y. Nagai, N. Hayashi, and M. Machida

Small jump of specific heat and small gap in iron pnictide superconductors
Physica C 470 (2010) S368
[link]

6. Y. Nagai, K. Kuroki, M. Machida, H. Aoki

Impurity effect in multi-orbital, sign-reversing s-wave superconductors
arXiv:1012.5565

5. M. Machida, Y. Nagai, Y. Ota, N. Nakai, H. Nakamura, and N. Hayashi

Phenomenological theory for ±s-wave superconducting states of iron-based superconductors
Physica C 470 (2010) S372
[link]

4. Y. Nagai, N. Hayashi, and M. Machida

Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: sign-reversing s-wave scenarios
Physica C 470 (2010) S504
[link] arXiv:0910.4040

3. N. Hayashi, Y. Nagai, and Y. Higashi

Analysis of field-angle dependent specific heat in unconventional superconductors: a comparison between Doppler-shift method and Kramer-Pesch approximation
Physica C 470, (2010) S865
[link] arXiv:0910.3993

2. Y. Nagai, N. Hayashi, Y. Kato, K. Yamauchi and H. Harima

Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi$_2$B$_2$C
Journal of Physics: Conference Series 150 (2009) 052177 [link]
arXiv:0901.2758

1. Y. Nagai, H. Akera and H. Suzuura

Spatial Variations of the Hall Potential and the Electron Temperature in Quantum Hall Systems with a Filling Factor Step
The Proceedings of the 28th International Conference on the Physics of Semiconductors. 2006, AIP Conference Proceedings 893 665 (2007). [link]

国際会議

19. Y. Nagai, H. Nakamura, and M. Machida

Andreev Bound-states in topological superconductors
M2S 2012 Materials and Mechanisms of Superconductivity , (Washington, D. C., USA, July 29– August 3 2012)
Poster

18. Y. Nagai, H. Nakamura, and M. Machida

Andreev Bound-states of vortices and surfaces in topological superconductors
International Conference Dubna-Nano2012, (Dubna, Russia, July 9–14 2012)
Oral (Invited)

17. J. W. Sadowski, K. Tanaka, Y. Nagai

Mechanism of charge density waves in an attractive Hubbard model
The Canadian Association of Physicists Annual Congress, University of Calgary, June 2012
Poster (K. Tanaka)

16. J. W. Sadowski, K. Tanaka, Y. Nagai

Effects of band structure and electron-phonon coupling on charge density waves
Theory Canada 7, University of Lethbridge, June 2012
Oral (The speaker is K. Tanaka)

15. Y. Nagai, K. Tanaka, and N. Hayashi

Numerical method of the quasiclassical theory for mesoscopic superconductors
Americal Physical Society March Meeting 2012 (Boston, USA, February 27–March 2 2012)
Poster

14. Y. Nagai, K. Tanaka, and N. Hayashi

Numerical method for mesoscopic superconductors in the quasiclassical theory
International workshop on Pathbreaking Phase Sciences in Superconductivity 2012 (Osaka Museum of History, Osaka, Japan, January 13-15)
Oral (Invited)

13. Y. Nagai, Y. Ota, and M. Machida

Spectral-density polynomial expansion for two-particle Green's function in BdG framework
24th International Symposium on Superconductivity 2011 (Funabari, Tokyo, Japan, October 26-28)
Poster

12. Y. Nagai, N. Nakai, and M. Machida

Direct Large-scale Numerical Demonstration of Quasiparticle Interference in Magnetic Fields: Orthonormal Polynomial Approach
12th International Workshop on Vortex Matter in Superconductors 2011 (Chicago, USA, July 31 - August 5)
Oral (Invited)

11. Y. Nagai, and M. Machida

Large-scale self-consistent BdG calculation in vortex lattice system
The First International Workshop on Superconducting Vortex Matter (Zhejiang Normal University, Jinhua, China, May 27-31)
Oral (Invited)

10. Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida

Theoretical study on inelastic neutron scattering on BaFe2(As1-xPx)2 by the realistic three-dimensional 10-orbital tight-binding model
International Workshop on Novel Superconductors and Super Materials 2011 (National Museum of Emerging Science and Innovation, Tokyo, Japan, March 6-8)
Poster

9. Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida

Theoretical analysis for inelastic neutron scattering on BaFe2(As1−xPx)2 by the realistic three-dimensional 10-orbital tight-binding model
International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (Ibaraki Quantum Beam Research Center (IQBRC), Tokai, Ibaraki, Japan, February 23-25)
Poster

8. Y. Nagai, K. Kuroki, M. Machida, and H. Aoki

Impurity effect in multi-orbital, sign-reversing s-wave superconductors
23rd International Symposium on Superconductivity 2010 (Tsukuba, Ibaraki, Japan, November 1-3)
Oral

7. Y. Nagai, and Y. Kato

Sign-reversing s-wave superconductors: Analysis of the Fe-based superconductors
12th International Workshop on Vortex Matter in Superconductors 2009 (Lake Yamanaka, Japan, August 12-16)
Oral (Invited)

6. Y. Nagai, N. Hayashi, and M. Machida

Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: sign-reversing s-wave scenarios
The 9th International Conference on Materials and Mechanisms of Superconductivity 2009 (Tokyo, Japan, August 7-12)
Poster

5. *D. Yoshioka, S. Nakakura and Y. Nagai

Unexpected current distribution in graphene ribbon with zigzag edges
The 18th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-18) (Kobe, Japan, July 19-24 2009)
Tu-eP971 Poster (The speaker is D. Yoshioka)

4. Y. Nagai, N. Hayashi, N. Nakai, H. Nakamura, M. Okumura and M. Machida

Anisotropic \pm s-wave Scenario as a Possible Superconductivity in Fe-based High-Tc Superconductor
International Symposium on Topological Science and Technology for Young Researchers 2009 (Sapporo, Japan, March 3-5)
Oral (Invited)

3. Y. Nagai, Y. Kato and N. Hayashi

Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C
25th international conference on Low Temperature Physics (Amsterdam, The Netherlands, August 6-13 2008)
Poster

2. Y. Nagai, Y. Kato and N. Hayashi

Field Angle Dependence of the Zero Energy Density of States in Unconventional Superconductors
YKIS2007 Interaction and Nanostructural Effects in Low-Dimensional Systems (Kyoto, Japan, November 5-30 2007)
Poster

1. Y. Nagai, *H. Akera and H. Suzuura

Spatial Variations of the Hall Potential and the Electron Temperature in Quantum Hall Systems with a Filling Factor Step
28th International Conference on the Physics of Semiconductors (Vienna, Austria, July 24-28 2006)
TuA3n.24 Poster (The speaker is H. Akera)

学会発表、国内会議

学会発表、国内会議のリストはこちら。

博士論文

永井佑紀
鉄系超伝導体の超伝導対称性に関する理論的研究
博士論文 (東京大学)
[PDF][10.9MB]
学位論文要旨[LINK]

修士論文

永井佑紀
超伝導量子渦糸系における局所電子状態密度に関する解析的理論
修士論文 (東京大学)
[PDF][7.06MB]
発表内容スライド[PDF][13.7MB]

卒業論文

Y. Nagai
Electron Temperature Distribution in Quantum Hall Systems with Potential Steps
Graduation Thesis (Hokkaido Univ.)
[PDF]

著書

永井佑紀 (著), 涌井貞美 (著), 現代用語の基礎知識 (編さん)
理科のおさらい物理 (おとなの楽習 5)
自由国民社
[Amazon]

ノート
私がつらつらと理解したことを載せています。ノートは間違っている可能性はありますので注意してください。
同じところでひっかかってしまっている人の手助けになればと思っています。

増えすぎたので別ページに移しました。

大阪府立大学での講義「超伝導シミュレーション研究の最前線」 2014年7月15日
講義発表資料（パスワード保護） (約35MB)

過去のお知らせ

2010年12月1日〜3日に

第１８回渦糸物理国内会議

を日本原子力研究開発機構システム計算科学センター（上野）で行います。
詳しくはこちらを参照してください。
無事終わりました。ありがとうございました。

共同研究者のリンク
東陽一さん(大阪府立大学)

一行日記。
大学院修士課程1年2月から博士課程3年3月までどう過ごしていたのか、の記録っぽいものになっている。

このページはリンクフリーです。

研究室のtopへ

2005年度夏学期：	物理学B（力学）TA
2006年度冬学期：	基礎物理学実験TA
2007年5月16日〜6月15日：	京都大学基礎物理学研究所アトム型研究員
2007年4月〜2008年3月：	理化学研究所古崎物性理論研究室JRA（ジュニア・リサーチ・アソシエイト）
2007年度冬学期：	基礎物理学実験TA（回数は半分）
2008年4月〜	日本学術振興会特別研究員(DC2)
2008年度冬学期：	基礎物理学実験TA（回数は半分）
2009年度冬学期：	基礎物理学実験TA（回数は半分）
2009年度冬学期：	英語ALESS Program 実験相談会TA
2016年11月〜2017年10月：	客員研究員（Visiting Scholar), Department of Physics, Massachusetts Institute of Technology, USA (Host reseacher: Prof. Liang Fu)
2010年4月〜2019年6月：	国立研究開発法人日本原子力研究開発機構　システム計算科学センター　シミュレーション技術開発室　研究員
2019年7月〜：	現職
2018年8月〜：	国立研究開発法人理化学研究所　革新知能統合研究センター数理科学チーム　客員研究員
2019年4月〜2020年3月：	学習院大学物理学科　非常勤講師　（担当講義:　熱学および統計力学２　物３年（第一学期）　および　熱学および統計力学３　物３年 (第二学期)）

1.	永井佑紀 (著), 涌井貞美 (著), 現代用語の基礎知識 (編さん)
	理科のおさらい物理 (おとなの楽習 5 自由国民社 [Amazon]
2.	門脇和男（編)
	超伝導磁束状態の物理裳華房 2章6.5節「BdG方程式による非一様な多バンド超伝導の理論」を執筆。 [Amazon]
3.	橋本幸士 (著), 大槻東巳 (著), 真野智裕 (著), 斎藤弘樹 (著), 藤田浩之 (著), 安藤康伸 (著), 永井佑紀 (著), 青木健一 (著), 藤田達大 (著), 小林玉青 (著), 大関真之 (著), 久良尚任 (著), 福嶋健二 (著), 村瀬功一 (著), 船井正太郎 (著), 柏浩司 (著), 富谷昭夫 (著), 橋本幸士 (編集)
	物理学者,機械学習を使うー機械学習・深層学習の物理学への応用ー朝倉書店第5章「自己学習モンテカルロ法」を執筆。 [Amazon]

59.	Hiroshi Shinaoka and Yuki Nagai
	Sparse modeling of large-scale quantum impurity models with low symmetries arXiv:2007.03955
58.	Hidehiko Kohshiro and Yuki Nagai
	Effective Ruderman-Kittel-Kasuya-Yosida-like interaction in diluted double-exchange model: self-learning Monte Carlo approach arXiv:2005.06992
57.	Yuki Nagai, Yang Qi, Hiroki Isobe, Vladyslav Kozii, andLiang Fu
	DMFT reveals the non-Hermitian topology in heavy-fermion systems arXiv:2005.06729
56.	Taiki Matsushita, Yuki Nagai, and Satoshi Fujimoto
	Spectrum collapse of disordered Dirac Landau levels as non-Hermitian topological phase transition arXiv:2004.11014
55.	Etsuko Itou and Y. Nagai
	Sparse modeling approach to obtaining the shear viscosity from smeared correlation functions Journal of High Energy Physics 2020, 7 (2020). [link] arXiv:2004.02426
54.	Majid Kheirkhah, Zhongbo Yan, Yuki Nagai, Frank Marsiglio
	First and second-order topological superconductivity and temperature-driven topological phase transitions in the extended Hubbard model with spin-orbit coupling Phys. Rev. Lett. 125, 017001 (2020). [link] arXiv:2001.08739
53.	Y. Nagai
	N-independent Localized Krylov Bogoliubov-de Gennes Method: Ultra-fast Numerical Approach to Large-scale Inhomogeneous Superconductors J. Phys. Soc. Jpn. 89, 074703 (2020). [link] arXiv:2001.02362
52.	K. Iida, Y. Nagai, S. Ishida, M. Ishikado, N. Murai, A. D. Christianson, H. Yoshida, Y. Inamura, H. Nakamura, A. Nakao, K. Munakata, D. Kagerbauer, M. Eisterer, K. Kawashima, Y. Yoshida, H. Eisaki, and A. Iyo
	Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4 Phys. Rev. B 100, 014506 (2019). [link] arXiv:1907.03839
51.	T. Matsushita, Y Nagai and S. Fujimoto
	Disorder-induced exceptional and hybrid rings in Weyl/Dirac semimetals Phys. Rev. B 100, 245205 (2019) [link] arXiv:1908.03345
50.	Yuki Nagai and Yusuke Kato
	Quasiparticle Bound States around Fractional Vortices in s-wave Superconductor J. Phys. Soc. Jpn. 88, 054707 (2019). [link] arXiv:1812.03646
49.	Majid Kheirkhah, Yuki Nagai, Chun Chen, Frank Marsiglio
	Majorana corner flat bands in two-dimensional second-order topological superconductors Phys. Rev. B 101, 104502 (2020). [link] arXiv:1904.00990
48.	Yuki Nagai, Masahiko Okumura, and Akinori Tanaka
	Self-learning Monte Carlo method with Behler-Parrinello neural networks Phys. Rev. B 101, 115111 (2020). [link] arXiv:1807.04955
47.	Yuki Nagai and Hiroshi Shinaoka
	Smooth self-energy in the exact-diagonalization-based dynamical mean-field theory: Intermediate-representation filtering approach J. Phys. Soc. Jpn. 88, 064004 (2019). [link] arXiv:1806.10316
46.	K. Iida, M. Ishikado, Y. Nagai, H. Yoshida, A. D. Christianson, N. Murai, K. Kawashima, Y. Yoshida, H. Eisaki, A. Iyo
	Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4 J. Phys. Soc. Jpn. 86, 093703 (2017). [link] arXiv:1708.01006
45.	Yuki Nagai, Huitao Shen, Yang Qi, Junwei Liu, and Liang Fu
	Self-Learning Monte Carlo Method: Continuous-Time Algorithm Phys. Rev. B 96, 161102(R) (2017). [link] Editors' Suggestion and Open Access arXiv:1705.06724
44.	S. L. Goertzen, K. Tanaka, and Y. Nagai
	Self-consistent study of Abelian and non-Abelian order in a two-dimensional topological superconductor Phys. Rev. B 95, 064509 (2017) [link] arXiv:1611.01610
43.	Y. Nagai, Yukihiro Ota, and K. Tanaka
	Time-reversal symmetry breaking and gapped surface states due to spontaneous emergence of new order in d-wave nanoislands Phys. Rev. B 96, 060503(R) (2016) [link] arXiv:1610.05501
42.	Howon Kim, Shi-Zeng Lin, Matthias J. Graf, Yoshinori Miyata, Yuki Nagai, Takeo Kato, and Yukio Hasegawa
	Electrical Conductivity through a Single Atomic Step Measured with the Proximity-Induced Superconducting Pair Correlation Phys. Rev. Lett 117, 116802 (2016). [link]
41.	Y. Nagai, Yasushi Shinohara, Yasunori Futamura, and Tetsuya Sakurai
	Reduced-Shifted Conjugate-Gradient Method for a Green's Function: Efficient Numerical Approach in a Nano-structured Superconductor J. Phys. Soc. Jpn. 86, 014708 (2017) [link] arXiv:1607.03992 The sample code is available.[Sample code]
40.	Shingo Yonezawa, Kengo Tajiri, Suguru Nakata, Yuki Nagai, Zhiwei Wang, Koji Segawa, Yoichi Ando, and Yoshiteru Maeno
	Thermodynamic evidence for nematic superconductivity in CuxBi2Se3 Nature Physics 13, 123 (2017) [link] arXiv:1602.08941
39.	Evan D. B. Smith, K. Tanaka, and Y. Nagai
	Manifestation of chirality in the vortex lattice in a two-dimensional topological superconductor Phys. Rev. B 94, 064515 (2016). [link] arXiv:1605.08934
38.	Y. Nagai and Y. Ota
	Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators Phys. Rev. B 94, 134516 (2016). [link] arXiv:1605.08164
37.	Yuki Nagai, Shintaro Hoshino, and Yukihiro Ota
	Critical Temperature Enhancement of Topological Superconductors: A Dynamical Mean Field Study Phys. Rev. B 93, 220505(R) (2016). [link] arXiv:1602.06087
36.	Yoichi Higashi, Yuki Nagai, Tomohiro Yoshida, Yusuke Masaki, and Youichi Yanase
	Robust zero-energy bound states around a pair-density-wave vortex core in locally noncentrosymmetric superconductors Phys. Rev. B 93, 104529 (2016). [link] arXiv:1602.00425
35.	A. Shitade and Y. Nagai
	Orbital angular momentum in a topological superconductor with Chern number higher than 1 Phys. Rev. B 93, 174517 (2016). [link] arXiv:1512.07997
34.	Y. Nagai, and H. Nakamura
	Multi-band Eilenberger theory of superconductivity: Systematic low-energy projection J. Phys. Soc. Jpn. 85, 074707 (2016). [link] arXiv:1507.06039
33.	Y. Nagai, H. Nakamura, M. Machida, and K. Kuroki
	First-principle study of antimony doping effects on the iron-based superconductor CaFe(Sb$_{x}$As$_{1-x}$)$_{2}$ J. Phys. Soc. Jpn. 84, 093702 (2015). [link] arXiv:1506.08515
32.	Y. Nagai, Y. Ota, and M. Machida
	Inverse coherence effects in nuclear magnetic relaxation rates as a sign of topological superconductivity Phys. Rev. B 92, 180502(R) (2015). [link] arXiv:1504.08095
31.	A. Shitade and Y. Nagai
	Orbital angular momentum in a nonchiral topological superconductor Phys. Rev. B 92, 024502 (2015). [link] arXiv:1501.06677
30.	Y. Nagai, H. Nakamura, M. Machida
	Surface states around a vortex in topological superconductors: Intersection of a surface and a vortex J. Phys. Soc. Jpn. 84, 033703 (2015). [link] arXiv:1412.5713
29.	Y. Nagai
	Robust superconductivity with nodes in the superconducting topological insulator CuxBi2Se3: Zeeman orbital field and non-magnetic impurities Phys. Rev. B 91, 060502(R) (2015). [link] arXiv:1410.4646
28.	Y. Nagai, Y. Ota, and M. Machida
	Topological s-wave pairing superconductivity with spatial inhomogeneity: Mid-gap-state appearance and Anderson's theorem J. Phys. Soc. Jpn. 84, 034711 (2015). [link] arXiv:1407.1125
27.	S. Yoshizawa, H. Kim, T. Kawakami, Y. Nagai, T. Nakayama, X. Hu, Y. Hasegawa, and T. Uchihashi
	Direct Observation of Josephson Vortices on the Surface Superconductor Si(111)-(root7xroot3)-In by Scanning Tunneling Microscopy Phys. Rev. Lett. 113, 247004. [link] Featured in Physics and Editors' Suggestion "Ultrathin Superconductors Take a Step Up" arXiv:1405.5953
26.	Y. Nagai
	Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3 J. Phys. Soc. Jpn. 83 (2014) 063705. [link] arXiv:1404.6874
25.	Y. Nagai, Y. Ota, and M. Machida
	From p- to s-wave behaviors in a three-dimensional topological superconductor with non-magnetic impurities Phys. Rev. B 89, 214506 (2014) 214506. [link] arXiv:1404.1662
24.	Y. Nagai, Y. Ota, and M. Machida
	Impurity effects in a two-dimensional topological superconductor: A link of Tc-robustness with a topological number J. Phys. Soc. Jpn. 83 (2014) 094722. [link] arXiv:1312.3065
23.	Y. Nagai, H. Nakamura, M. Machida
	Quasiclassical Treatment and Odd-parity/Triplet Correspondence in Topological Superconductors J. Phys. Soc. Jpn. 83 (2014) 053705. [link] arXiv:1305.3025
22.	Y. Higashi, Y. Nagai, M. Machida, N. Hayashi
	Field-angle Resolved Flux-flow Resistivity as a Phase-sensitive Probe of Unconventional Cooper Pairing Phys. Rev. B 88 (2013) 224511. [link] arXiv:1304.6509
21.	Y. Nagai, Yasushi Shinohara, Yasunori Futamura, Yukihiro Ota, and Tetsuya Sakurai
	Numerical construction of a low-energy effective Hamiltonian in a self-consistent Bogoliubov-de Gennes approach of superconductivity J. Phys. Soc. Jpn. 82 (2013) 094701. [link] arXiv:1303.3683
20.	Y. Nagai, H. Nakamura, and M. Machida
	Spin-polarized Majorana Bound States around a Vortex in Topological Superconductors J. Phys. Soc. Jpn. 83 (2014) 064703. [link] Papers of Editors' Choice "Hunting Majorana Fermions in Topological Superconductors" in JPSJ News and Comments arXiv:1211.0125
19.	Y. Nagai, H. Nakamura, and M. Machida
	Rotational Isotropy Breaking as Proof for Spin-polarized Cooper Pair in Topological Superconductor CuxBi2Se3 Phys. Rev. B 86 (2012) 094507. [link] arXiv:1206.0563
18.	Y. Nagai, K. Tanaka, and N. Hayashi
	Quasiclassical numerical method for mesoscopic superconductors: bound states in a circular d-wave island with a single vortex Phys. Rev. B 86 (2012) 094526. [link] arXiv:1202.2661
17.	Y. Nagai, and K. Kuroki
	Q-scan-analysis of the neutron scattering in iron-based superconductors Phys. Rev. B 85 (2012) 134521. [link] arXiv:1201.2453
16	Y. Nagai, Y. Ota, and M. Machida
	Efficient Numerical Self-consistent Mean-field Approach for Fermionic Many-body Systems by Polynomial Expansion on Spectral Density J. Phys. Soc. Jpn. 81 (2012) 024710. [link] arXiv:1105.4939
15	Y. Nagai, N. Nakai, and M. Machida
	Direct Numerical Demonstration of Sign-preserving Quasiparticle Interference via Impurity inside Vortex Core in Unconventional Superconductors Phys. Rev. B 85 (2012) 092505. [link] arXiv:1103.5842
14.	Y. Nagai, and K. Kuroki
	Determination of the pairing state in iron-based superconductors through neutron scattering Phys. Rev. B 83 (2011) 220516(R). [link] arXiv:1103.0586
13.	Y. Nagai, H. Nakamura, and M. Machida
	Superconducting Gap Function in an Organic Superconductor (TMTSF)2ClO4 with Anion Ordering; First-principles Calculations and Quasi-classical Analyses for Angle-resolved Heat Capacity Phys. Rev. B 83 (2011) 104523. [link] arXiv:1101.2277
12.	M. Ishikado, Y. Nagai, K. Kodama, R. Kajimoto, M. Nakamura, Y. Inamura, S. Wakimoto, H. Nakamura, M. Machida, K. Suzuki, H. Usui, K. Kuroki, A. Iyo, H. Eisaki, M. Arai, S. Shamoto
	s±-like spin resonance in the iron-based nodal superconductor BaFe2(As0.65P0.35)2 observed using inelastic neutron scattering Phys. Rev. B 84 (2011) 144517. [link] arXiv:1011.3191
11.	Y. Imai, H. Takahashi, K. Kitagawa, K. Matsubayashi, N. Nakai, Y. Nagai, Y. Uwatoko, M. Machida, A. Maeda
	Microwave Surface Impedance Measurements of LiFeAs Single Crystals J. Phys. Soc. Jpn. 80 (2011) 013704. [link] arXiv:1009.4628
10.	M. Kunimi, Y. Nagai , and Y. kato
	Josephson effects in one-dimensional supersolids Phys. Rev. B 84 (2011) 094521. [link] arXiv:1005.3936
9.	N. Nakai, H. Nakamura, Y. Ota, Y. Nagai , N. Hayashi and M. Machida
	First-principles-based pm s-wave modelling for iron-based superconductors:Studies for specific heat and nuclear magnetic relaxation rate Phys. Rev. B 82 (2010) 094501. [link] arXiv:0909.1195
8.	Y. Nagai and Y. Kato
	Impurity scattering rate and coherence factor in vortex core of sign-reversing s-wave superconductors Phys. Rev. B 82 (2010) 174507. [link] arXiv:0908.4451
7.	S. Nakakura, Y. Nagai and D. Yoshioka
	Uniform current in graphene strip with zigzag edges J. Phys. Soc. Jpn. 78 (2009) 065003. [link] arXiv:0903.1483
6.	Y. Nagai and N. Hayashi
	Surface Bound States in n-band Systems with Quasiclassical Approach Phys. Rev. B 79 (2009) 224508. [link] arXiv:0903.1227
5.	Y. Nagai, N. Hayashi, N. Nakai, H. Nakamura, M. Okumura and M. Machida
	Nuclear magnetic relaxation and superfluid density in Fe-pnictide superconductors: An anisotropic \pm s-wave scenario New J. Phys. 10 (2008) 103026. [link] arXiv:0809.1197
4.	Y. Nagai and N. Hayashi
	Kramer-Pesch approximation for analyzing field-angle-resolved measurements made in unconventional superconductors: A calculation of the zero-energy density of states Phys. Rev. Lett. 101 (2008) 097001. [link] arXiv:0802.1579
3.	Y. Nagai, Y. Kato, N. Hayashi, K. Yamauchi and H. Harima
	Calculated Positions of Point Nodes in the Gap Structure of the Borocarbide Superconductor YNi2B2C Phys. Rev. B 76, (2007) 214514. [link] arXiv:0706.1863
2.	Y. Nagai, Y. Ueno, Y. Kato and N. Hayashi
	Analytical Formulation of the Local Density of States around a Vortex Core in Unconventional Superconductors J. Phys. Soc. Jpn. 75 (2006) 104701.[link] cond-mat/0605441
1.	Y. Nagai, Y. Kato and N. Hayashi
	Analytical Result on Electronic States around a Vortex Core in a Noncentrosymmetric Superconductor J. Phys. Soc. Jpn. 75 (2006) 043706 [link] cond-mat/0602254

1.	Y. Nagai and K. Kuroki
	Comment on arXiv:1105.6233 entitled "Neutron-Inelastic-Scattering Peak by Dissipationless Mechanism in the s++-wave State in Iron-based Superconductors" by S. Onari and H. Kontani arXiv:1106.2376

25.	Y. Ota, Y. Nagai, and M. Machida
	Theory of low-energy behaviors in topological s-wave pairing superconductors Physica C. 518 5 (2015) [link]
24.	Y. Higashi, Y. Nagai, T. Yoshida, M. Kato and Y. Yanase
	Excitation spectra and wave functions of quasiparticle bound states in bilayer Rashba superconductors Physica C. 518 1 (2015) [link]
23.	T. Kawakami, Y. Nagai, S. Yoshizawa, H. Kim, Y. Hasegawa, T. Nakayama, T. Uchihashi and X. Hu
	Excitation spectrum of Josephson vortices on surface superconductor J. Phys.: Conf. Ser. 568 022022 (2014) [link]
22.	Y. Higashi, Y. Nagai, T. Yoshida, and Y. Yanase
	Vortex Core Structure in Multilayered Rashba Superconductors J. Phys.: Conf. Ser. 568 022018 (2014) [link]
21.	Y. Nagai, Y. Ota, and M. Machida,
	Robustness against non-magnetic impurities in topological superconductors J. Phys.: Conf. Ser. 568 022030 (2014) [link]
20.	Y. Nagai, H. Nakamura, and M. Machida,
	Inhomogeneity Effects in Topological Superconductors JPS Conf. Proc. 3, 015013 (2014) [link]
19.	T. Higashi, Y. Nagai, and N. Hayashi,
	Impurity Effect on the Local Density of States around a Vortex in Noncentrosymmetric Superconductors JPS Conf. Proc. 3, 015003 (2014) [link]
18.	T. Yamane, Y. Nagai, K. Tanaka, and N. Hayashi,
	Impurity scattering effect on the zero-energy peak of the local density of states in a multi-quantum vortex core Physica C 494 (2013), 128 [link]
17.	Y. Nagai, H. Nakamura, and M. Machida
	Surface and vortex bound states in topological superconductors Physica C 494 (2013), 17 [link]
16.	J. W. Sadowski, K. Tanaka, and Y. Nagai
	Effects of band structure and electron-phonon coupling on charge density waves Canadian Journal of Physics, 91 (2013) 487 [link]
15.	Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi
	Effect of Anisotropic Fermi Surface on the Flux-flow Resistivity under Rotating Magnetic Field Physics Procedia 45 (2013) 137 [link]
14.	Y. Nagai, H. Nakamura, and M. Machida
	Andreev Bound-states of vortices and surfaces in topological superconductors J. Phys.: Conf. Ser. 393 (2012) 012017 [link]
13.	Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi
	Effect of uniaxially anisotropic Fermi surface on the quasiparticle scattering inside a vortex core in unconventional superconductors Physica C 484 (2013) 97 [link]
12.	Y. Higashi, Y. Nagai, M. Machida, and N. Hayashi
	Phase-Sensitive Flux-Flow resistivity in Unconventional Superconductors J. Phys.: Conf. Ser. 400, (2012) 022025 [link]
11.	Y. Nagai, Y. Ota, and M. Machida
	Spectral-density polynomial expansion for two-particle Green's function in BdG framework Physics Procedia 27 (2012) 72 [link]
10.	Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida
	Theoretical analysis for inelastic neutron scattering on BaFe2(As1−xPx)2 by the realistic three-dimensional 10-orbital tight-binding model J. Phys. Soc. Jpn. 80 (2011) SB021 [link]
9.	Y. Higashi, Y. Nagai, M. Machida and N. Hayashi
	Field-angle dependence of the quasiparticle scattering inside a vortex core in unconventional superconductors Physica C 471 (2011) 828 [link]
8.	N. Nakai, Y. Nagai, and M. Machida
	Low-lying excitations induced by non-magnetic impurities in d-wave superconductors Physica C 471 (2011) 743 [link]
7.	N. Nakai, H. Nakamura, Y. Ota, Y. Nagai, N. Hayashi, and M. Machida
	Small jump of specific heat and small gap in iron pnictide superconductors Physica C 470 (2010) S368 [link]
6.	Y. Nagai, K. Kuroki, M. Machida, H. Aoki
	Impurity effect in multi-orbital, sign-reversing s-wave superconductors arXiv:1012.5565
5.	M. Machida, Y. Nagai, Y. Ota, N. Nakai, H. Nakamura, and N. Hayashi
	Phenomenological theory for ±s-wave superconducting states of iron-based superconductors Physica C 470 (2010) S372 [link]
4.	Y. Nagai, N. Hayashi, and M. Machida
	Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: sign-reversing s-wave scenarios Physica C 470 (2010) S504 [link] arXiv:0910.4040
3.	N. Hayashi, Y. Nagai, and Y. Higashi
	Analysis of field-angle dependent specific heat in unconventional superconductors: a comparison between Doppler-shift method and Kramer-Pesch approximation Physica C 470, (2010) S865 [link] arXiv:0910.3993
2.	Y. Nagai, N. Hayashi, Y. Kato, K. Yamauchi and H. Harima
	Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi$_2$B$_2$C Journal of Physics: Conference Series 150 (2009) 052177 [link] arXiv:0901.2758
1.	Y. Nagai, H. Akera and H. Suzuura
	Spatial Variations of the Hall Potential and the Electron Temperature in Quantum Hall Systems with a Filling Factor Step The Proceedings of the 28th International Conference on the Physics of Semiconductors. 2006, AIP Conference Proceedings 893 665 (2007). [link]

19.	Y. Nagai, H. Nakamura, and M. Machida
	Andreev Bound-states in topological superconductors M2S 2012 Materials and Mechanisms of Superconductivity , (Washington, D. C., USA, July 29– August 3 2012) Poster
18.	Y. Nagai, H. Nakamura, and M. Machida
	Andreev Bound-states of vortices and surfaces in topological superconductors International Conference Dubna-Nano2012, (Dubna, Russia, July 9–14 2012) Oral (Invited)
17.	J. W. Sadowski, K. Tanaka, Y. Nagai
	Mechanism of charge density waves in an attractive Hubbard model The Canadian Association of Physicists Annual Congress, University of Calgary, June 2012 Poster (K. Tanaka)
16.	J. W. Sadowski, K. Tanaka, Y. Nagai
	Effects of band structure and electron-phonon coupling on charge density waves Theory Canada 7, University of Lethbridge, June 2012 Oral (The speaker is K. Tanaka)
15.	Y. Nagai, K. Tanaka, and N. Hayashi
	Numerical method of the quasiclassical theory for mesoscopic superconductors Americal Physical Society March Meeting 2012 (Boston, USA, February 27–March 2 2012) Poster
14.	Y. Nagai, K. Tanaka, and N. Hayashi
	Numerical method for mesoscopic superconductors in the quasiclassical theory International workshop on Pathbreaking Phase Sciences in Superconductivity 2012 (Osaka Museum of History, Osaka, Japan, January 13-15) Oral (Invited)
13.	Y. Nagai, Y. Ota, and M. Machida
	Spectral-density polynomial expansion for two-particle Green's function in BdG framework 24th International Symposium on Superconductivity 2011 (Funabari, Tokyo, Japan, October 26-28) Poster
12.	Y. Nagai, N. Nakai, and M. Machida
	Direct Large-scale Numerical Demonstration of Quasiparticle Interference in Magnetic Fields: Orthonormal Polynomial Approach 12th International Workshop on Vortex Matter in Superconductors 2011 (Chicago, USA, July 31 - August 5) Oral (Invited)
11.	Y. Nagai, and M. Machida
	Large-scale self-consistent BdG calculation in vortex lattice system The First International Workshop on Superconducting Vortex Matter (Zhejiang Normal University, Jinhua, China, May 27-31) Oral (Invited)
10.	Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida
	Theoretical study on inelastic neutron scattering on BaFe2(As1-xPx)2 by the realistic three-dimensional 10-orbital tight-binding model International Workshop on Novel Superconductors and Super Materials 2011 (National Museum of Emerging Science and Innovation, Tokyo, Japan, March 6-8) Poster
9.	Y. Nagai, H. Nakamura, K. Suzuki, H. Usui, K. Kuroki, and M. Machida
	Theoretical analysis for inelastic neutron scattering on BaFe2(As1−xPx)2 by the realistic three-dimensional 10-orbital tight-binding model International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (Ibaraki Quantum Beam Research Center (IQBRC), Tokai, Ibaraki, Japan, February 23-25) Poster
8.	Y. Nagai, K. Kuroki, M. Machida, and H. Aoki
	Impurity effect in multi-orbital, sign-reversing s-wave superconductors 23rd International Symposium on Superconductivity 2010 (Tsukuba, Ibaraki, Japan, November 1-3) Oral
7.	Y. Nagai, and Y. Kato
	Sign-reversing s-wave superconductors: Analysis of the Fe-based superconductors 12th International Workshop on Vortex Matter in Superconductors 2009 (Lake Yamanaka, Japan, August 12-16) Oral (Invited)
6.	Y. Nagai, N. Hayashi, and M. Machida
	Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: sign-reversing s-wave scenarios The 9th International Conference on Materials and Mechanisms of Superconductivity 2009 (Tokyo, Japan, August 7-12) Poster
5.	*D. Yoshioka, S. Nakakura and Y. Nagai
	Unexpected current distribution in graphene ribbon with zigzag edges The 18th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-18) (Kobe, Japan, July 19-24 2009) Tu-eP971 Poster (The speaker is D. Yoshioka)
4.	Y. Nagai, N. Hayashi, N. Nakai, H. Nakamura, M. Okumura and M. Machida
	Anisotropic \pm s-wave Scenario as a Possible Superconductivity in Fe-based High-Tc Superconductor International Symposium on Topological Science and Technology for Young Researchers 2009 (Sapporo, Japan, March 3-5) Oral (Invited)
3.	Y. Nagai, Y. Kato and N. Hayashi
	Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C 25th international conference on Low Temperature Physics (Amsterdam, The Netherlands, August 6-13 2008) Poster
2.	Y. Nagai, Y. Kato and N. Hayashi
	Field Angle Dependence of the Zero Energy Density of States in Unconventional Superconductors YKIS2007 Interaction and Nanostructural Effects in Low-Dimensional Systems (Kyoto, Japan, November 5-30 2007) Poster
1.	Y. Nagai, *H. Akera and H. Suzuura
	Spatial Variations of the Hall Potential and the Electron Temperature in Quantum Hall Systems with a Filling Factor Step 28th International Conference on the Physics of Semiconductors (Vienna, Austria, July 24-28 2006) TuA3n.24 Poster (The speaker is H. Akera)