English / Japanese

永井佑紀

(独)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 一般研究員

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(予定): Visiting Scholar, Department of Physics, Massachusetts Institute of Technology, USA (Host reseacher: Prof. Liang Fu)
2010年4月〜: 現職

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]

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


原著論文

それぞれの論文の簡単な日本語解説はこちら

45. Yuki Nagai, Huitao Shen, Yang Qi, Junwei Liu, and Liang Fu
Self-Learning Monte Carlo Method: Continuous-Time Algorithm
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
Spontaneous breaking of topological protection in a d-wave nanoisland: Second-order phase transition with the spontaneous time-reversal symmetry breaking
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