20012005 : B. Eng. Department of Applied Physics, Hokkaido University.
Supervisor : Prof. H. Akera.
Subject : "Electron Temperature Distribution in Quantum Hall Systems with Potential Steps"
20052007 : M. Sci. Department of Physics, University of Tokyo.
Supervisor : Asso. Prof. Y. Kato.
Subject : "Analytical Theory of the Local Density of States around a Vortex in Superconductors"
20072010 : Ph. D. research at Department of Physics, University of Tokyo.
Supervisor : Asso. Prof. Y. Kato.
Subject : "Theoretical study of pairing symmetries in ironbased superconductors"
Awards
Mar. 2015: Young Scientist Award of the Physical Society of Japan
41. 
Y. Nagai, Yasushi Shinohara, Yasunori Futamura, and Tetsuya Sakurai 
ReducedShifted ConjugateGradient Method for a Green's Function: Efficient Numerical Approach in a Nanostructured Superconductor
arXiv:1607.03992 

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
arXiv:1602.08941 

39. 
Evan D. B. Smith, K. Tanaka, and Y. Nagai 
Manifestation of chirality in the vortex lattice in a twodimensional topological superconductor
arXiv:1605.08934 

38. 
Y. Nagai and Y. Ota 
Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
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 zeroenergy bound states around a pairdensitywave 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 
Multiband Eilenberger theory of superconductivity: Systematic lowenergy projection
arXiv:1507.06039 

33. 
Y. Nagai, H. Nakamura, M. Machida, and K. Kuroki 
Firstprinciple study of antimony doping effects on the ironbased superconductor CaFe(Sb$_{x}$As$_{1x}$)$_{2}$
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 nonmagnetic impurities
Phys. Rev. B 91, 060502(R) (2015). [link] arXiv:1410.4646 

28. 
Y. Nagai, Y. Ota, and M. Machida 
Topological swave pairing superconductivity with spatial inhomogeneity: Midgapstate 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 
Fieldangledependent lowenergy 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 swave behaviors in a threedimensional topological superconductor with nonmagnetic impurities
Phys. Rev. B 89, 214506 (2014) 214506. [link] arXiv:1404.1662 

24. 
Y. Nagai, Y. Ota, and M. Machida 
Impurity effects in a twodimensional topological superconductor: A link of Tcrobustness 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 Oddparity/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 
Fieldangle Resolved Fluxflow Resistivity as a Phasesensitive 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 lowenergy effective Hamiltonian in a selfconsistent Bogoliubovde Gennes approach of superconductivity
J. Phys. Soc. Jpn. 82 (2013) 094701. [link] arXiv:1303.3683 

20. 
Y. Nagai, H. Nakamura, and M. Machida 
Spinpolarized 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 Spinpolarized 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 dwave island with a single vortex
Phys. Rev. B 86 (2012) 094526. [link] arXiv:1202.2661 

17. 
Y. Nagai, and K. Kuroki 
Qscananalysis of the neutron scattering in ironbased superconductors
Phys. Rev. B 85 (2012) 134521. [link] arXiv:1201.2453 

16 
Y. Nagai, Y. Ota, and M. Machida 
Efficient Numerical Selfconsistent Meanfield Approach for Fermionic Manybody 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 Signpreserving 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 ironbased 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; Firstprinciples Calculations and Quasiclassical Analyses for Angleresolved 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 ironbased 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 onedimensional 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

Firstprinciplesbased €pm swave modelling for ironbased
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 signreversing swave 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 nband 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 Fepnictide superconductors: An anisotropic \pm swave scenario New J. Phys. 10 (2008) 103026. [link] arXiv:0809.1197 

4.  Y. Nagai and N. Hayashi 
KramerPesch approximation for analyzing fieldangleresolved
measurements made in unconventional superconductors: A calculation of
the zeroenergy 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] condmat/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] condmat/0602254 
1. 
Y. Nagai and K. Kuroki 
Comment on arXiv:1105.6233 entitled "NeutronInelasticScattering Peak by Dissipationless Mechanism in the s++wave State in Ironbased Superconductors" by S. Onari and H. Kontani
arXiv:1106.2376 
25. 
Y. Ota, Y. Nagai, and M. Machida 
Theory of lowenergy behaviors in topological swave 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 nonmagnetic 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 zeroenergy peak of the local density of states in a multiquantum 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 electronphonon 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 Fluxflow Resistivity under Rotating Magnetic Field
Physics Procedia 45 (2013) 137 [link] 

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

Andreev Boundstates 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

PhaseSensitive FluxFlow resistivity in Unconventional Superconductors
J. Phys.: Conf. Ser. 400, (2012) 022025 [link] 

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

Spectraldensity polynomial expansion for twoparticle 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 threedimensional 10orbital tightbinding model
J. Phys. Soc. Jpn. 80 (2011) SB021 [link] 

9. 
Y. Higashi, Y. Nagai, M. Machida and N. Hayashi 
Fieldangle 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 
Lowlying excitations induced by nonmagnetic impurities in dwave 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 multiorbital, signreversing swave superconductors
arXiv:1012.5565 

5. 
M. Machida, Y. Nagai, Y. Ota, N. Nakai, H. Nakamura, and N. Hayashi 
Phenomenological theory for ±swave superconducting states of ironbased superconductors
Physica C 470 (2010) S372 [link] 

4.  Y. Nagai, N. Hayashi, and M. Machida 
Surfaceangle dependence of the tunneling spectroscopy in ironbased superconductors: signreversing swave scenarios Physica C 470 (2010) S504 [link] arXiv:0910.4040 

3. 
N. Hayashi, Y. Nagai, and Y. Higashi 
Analysis of fieldangle dependent specific heat in unconventional superconductors: a comparison between Dopplershift method and KramerPesch 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 zeroenergy 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 Boundstates 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 Boundstates of vortices and surfaces in topological superconductors
International Conference DubnaNano2012, (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 electronphonon 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 1315) Oral (Invited)


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

Spectraldensity polynomial expansion for twoparticle Green's function in BdG framework
24th International Symposium on Superconductivity 2011 (Funabari, Tokyo, Japan, October 2628) Poster


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

Direct Largescale 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

Largescale selfconsistent BdG calculation in vortex lattice system
The First International Workshop on Superconducting Vortex Matter (Zhejiang Normal University, Jinhua, China, May 2731) Oral (Invited)


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

Theoretical study on inelastic neutron scattering on BaFe2(As1xPx)2 by the realistic threedimensional 10orbital tightbinding model
International Workshop on Novel Superconductors and Super Materials 2011 (National Museum of Emerging Science and Innovation, Tokyo, Japan, March 68) Poster


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

Theoretical analysis for inelastic neutron scattering on BaFe2(As1xPx)2 by the realistic threedimensional 10orbital tightbinding model
International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (Ibaraki Quantum Beam Research Center (IQBRC), Tokai, Ibaraki, Japan, February 2325) Poster


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

Impurity effect in multiorbital, signreversing swave superconductors
23rd International Symposium on Superconductivity 2010 (Tsukuba, Ibaraki, Japan, November 13) Oral


7.  Y. Nagai, and Y. Kato

Signreversing swave superconductors: Analysis of the Febased superconductors
12th International Workshop on Vortex Matter in Superconductors 2009 (Lake Yamanaka, Japan, August 1216) Oral (Invited)


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

Surfaceangle dependence of the tunneling spectroscopy in ironbased
superconductors: signreversing swave scenarios
The 9th International Conference on Materials and Mechanisms of Superconductivity 2009 (Tokyo, Japan, August 712) 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 TwoDimensional Systems (EP2DS18) (Kobe, Japan, July 1924 2009) TueP971 Poster (The speaker is D. Yoshioka)


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

Anisotropic \pm swave Scenario as a Possible Superconductivity in
Febased HighTc Superconductor
International Symposium on Topological Science and Technology for Young Researchers 2009 (Sapporo, Japan, March 35) Oral (Invited)


3.  Y. Nagai, Y. Kato and N. Hayashi 
Field angle dependence of the zeroenergy density of
states in unconventional superconductors: analysis of
the borocarbide superconductor YNi2B2C 25th international conference on Low Temperature Physics (Amsterdam, The Netherlands, August 613 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 LowDimensional Systems (Kyoto, Japan, November 530 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 2428 2006) TuA3n.24 Poster (The speaker is H. Akera)

Y. Nagai 

Theoretical study of pairing symmetries in ironbased superconductors (in Japanese) Doctor Thesis (Univ. of Tokyo) [PDF]

Y. Nagai 

Analytical Theory of the Local Density of States around a Vortex in Superconductors (in Japanese) Master Thesis (Univ. of Tokyo) [PDF]

Y. Nagai 

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