東京工業大学 理学院 物理学系
物性理論グループ 古賀研究室
発表論文
研究内容
発表論文
会 議 録
解 説
学会発表
国際会議
修士論文
博士論文
受 賞
Preprint
1. Aperiodic approximants bridging quasicrystals and modulated structures
T. Matsubara, A. Koga, A. Takano, Y. Matsushita, T. Dotera, arXiv:2403.16010.
2. Hyperuniformity in two-dimensional periodic and quasiperiodic point patterns
A. Koga and S. Sakai, arXiv:2311.07901.
3. Hexagonal and trigonal quasiperiodic tilings
S. Coates, A. Koga, T. Matsubara, R. Tamura, H. R. Sharma, R. McGrath, and R. Lifshitz, arXiv:2201.11848.
4. High Temperature Fermi Statistics from Majorana Fermions in an Insulating Magnet
Y. Wang, G. B. Osterhoudt, Y. Tian, P. Lampen-Kelley, A. Banerjee, T. Goldstein, J. Yan, J. Knolle, J. Nasu, Y. Motome, S. Nagler, D. Mandrus, and K. S. Burch, arXiv:1809.07782.
5. Intersite electron correlations on inhomogeneous lattices: a real-space dual fermion approach
N. Takemori, A. Koga, and H. Hafermann, arXiv:1801.02441.
2024
6. Theory of non-Hermitian fermionic superfluidity on a honeycomb lattice: Interplay between exceptional manifolds and Van Hove singularity
S. Takemori, K. Yamamoto, and A. Koga, Phys. Rev. B 109, L060501 (2024).
7. Ferromagnetically ordered states in the Hubbard model on the H00 hexagonal golden-mean tiling
T. Matsubara, A. Koga, and S. Coates, Phys. Rev. B 109, 014413 1-11 (2024).
2023
8. Efficient Control of High Harmonic Generation in Carbon Nanotubes using the Aharonov-Bohm Effect
Y. Murakami, K. Nagai, and A. Koga, Phys. Rev. B 108, L241202 1-6 (2023).
9. Energy flow during relaxation in an electron-phonon system with multiple modes: A nonequilibrium Green's function study
K. Inayoshi, A. Koga, and Y. Murakami, J. Phys. Soc. Jpn. 92, 124001 1-17 (2023).
10. Interaction-induced Liouvillian skin effect in a fermionic chain with a two-body loss
S. Hamanaka, K. Yamamoto, and T. Yoshida, Phys. Rev. B 108, 155114 (2023).
11. Quantum algorithm for the microcanonical Thermal Pure Quantum method
K. Mizukami and A. Koga, Phys. Rev. A 108, 012404 1-10 (2023).
12. Localization properties in disordered quantum many-body dynamics under continuous measurement
K. Yamamoto and R. Hamazaki, Phys. Rev. B 107, L220201 (2023).
13. Majorana Gap Formation in the Anisotropic Kitaev Model with Ordered Flux Configuration
A. Hashimoto, Y. Murakami, and A. Koga, Phys. Rev. B 107, 174428 1-8 (2023).
2022
14. Optical response of the tightbinding model on the Fibonacci chain
H. Iijima, Y. Murakami, and A. Koga, J. Phys. Soc. Jpn. 91, 124702 1-5 (2022).
15. Anomalous temperature dependence of high-harmonic generation in Mott insulators
Y. Murakami, K. Uchida, A. Koga, K. Tanaka, and P. Werner, Phys. Rev. Lett. 129, 157401 1-6 (2022).
16. Unveiling the underlying interactions in Ta2NiSe5 from photo-induced lifetime change
D. Golez, S. K. Y. Dufresne, M. Kim, F. Boschini, H. Chu, Y. Murakami, G. Levy, A. K. Mills, S. Zhdanovich, M. Isobe, H. Takagi, S. Kaiser, P. Werner, D. J. Jones, A. Georges, A. Damascelli, A. J. Millis, Phys. Rev. B 106, L121106 1-6 (2022).
17. Doping and gap-size dependence of high-harmonic generation in graphene : Importance of consistent formulation of light-matter coupling
Y. Murakami and M. Schüler, Phys. Rev. B 106, 035204 1-13 (2022).
18. Scattering phenomena for spin transport in Kitaev spin liquid
J. Nasu, Y. Murakami, and A. Koga, Phys. Rev. B 106, 024411 1-15 (2022).
19. Thermally enhanced Majorana-mediated spin transport in the Kitaev model
H. Taguchi, Y. Murakami and A. Koga, Phys. Rev. B 105, 125137 1-6 (2022).
20. Photoinduced dynamics of a quasicrystalline excitonic insulator
K. Inayoshi, Y. Murakami, and A. Koga, Phys. Rev. B 105, 104307 1-13 (2022).
21. Ferrimagnetically ordered states in the Hubbard model on the hexagonal golden-mean tiling
A. Koga and S. Coates, Phys. Rev. B 105, 104410 1-9 (2022).
22. Exploring nonequilibrium phases of photo-doped Mott insulators with Generalized Gibbs ensembles
Y. Murakami, S. Takayoshi, T. Kaneko, Z. Sun, D. Golez, A. J. Millis and P. Werner, Comm. Phys. 5, 23 (2022).
2021
23. Light-induced hidden odd-frequency order in a model for A3C60
P. Werner and Y. Murakami, Phys. Rev. B 104, L201101 (2021).
24. Role of Majorana fermions in spin transport of anisotropic Kitaev model
H. Taguchi, Y. Murakami, A. Koga and J. Nasu, Phys. Rev. B 104, 125139 (2021).
25. Bulk photovoltaic effect driven by collective excitations in a correlated insulator
T. Kaneko, Z. Sun, Y. Murakami, D. Golez and A. J. Millis, Phys. Rev. Lett. 127, 127402 (2021).
26. Imaging the coherent propagation of collective modes in the excitonic insulator candidate Ta2NiSe5 at room temperature
P. Andrich, H. M. Bretscher, Y. Murakami, D. Golez, B. Remez, P. Telang, A. Singh, L. Harnagea, N. R. Cooper, A. J. Millis, P. Werner, A. K. Sood, and A. Rao, Sci. Adv. 7, eabd6147 (2021).
27. Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A3C60
C. Yue, S. Hoshino, A. Koga, and P. Werner, Phys. Rev. B 104, 075107 1-8 (2021).
28. Majorana correlations in the Kitaev model with ordered-flux structures
A. Koga, Y. Murakami, and J. Nasu, Phys. Rev. B 103, 214421 1-9 (2021).
29. Photo-induced phase transition and associated time scales in the excitonic insulator Ta2NiSe5
T. Saha, D. Golez, G. D. Ninno, J. Mravlje, Y. Murakami, B. Ressel, M. Stupar, P. R. Ribic, Phys. Rev. B 103, 144304 (2021).
30. Gauge invariance of light-matter interactions in first-principle tight-binding models
M. Schuler, J. A. Marks, Y. Murakami, C. Jia, T. P. Devereaux, Phys. Rev. B 103, 155409 (2021).
31. Antiferromagnetically ordered state in the half-filled Hubbard model on the Socolar dodecagonal tiling
A. Koga, Mater. Trans. 62, 360-366 (2021).
32. Effect of Electron-Electron Interactions on Metallic State in Quasicrystals
S. Sakai and A. Koga, Mater. Trans. 62, 380-385 (2021).
33. High-harmonic generation in one-dimensional Mott insulator
Y. Murakami, S. Takayoshi, A. Koga and P. Werner, Phys. Rev. B 103, 035110 (2021).
2020
34. Nonlinear spectroscopy of collective modes in excitonic insulator
D. Golez, Z. Sun, Y. Murakami, A. Georges, A. J. Millis, Phys. Rev. Lett. 125, 257601 (2020).
35. Nonthermal excitonic condensation near a spin-state transition
P. Werner, Y. Murakami, Phys. Rev. B 102, 241103 (2020).
36. Superlattice structure in the antiferromagnetically ordered state in the Hubbard model on the Ammann-Beenker tiling
A. Koga, Phys. Rev. B 102, 115125 (2020).
37. High-harmonic generation in spin-orbit coupled systems
M. Lysne, Y. Murakami, M. Schüler, and P. Werner, Phys. Rev. B 102, 081121 (2020).
38. NESSi: The Non-Equilibrium Systems Simulation package
M. Schüler, D. Golez, Y. Murakami, N. Bittner, A. Hermann, H. U. R. Strand, P. Werner and M. Eckstein, Comp. Phys. Comm. 257, 107484 (2020).
39. Signatures of bosonic excitations in high-harmonic spectra of Mott insulators
M. Lysne, Y. Murakami, and P. Werner, Phys. Rev. B 101, 195139 (2020).
40. Majorana-mediated spin transport in Kitaev quantum spin liquids
T. Minakawa, Y. Murakami, A. Koga, and J. Nasu, Phys. Rev. Lett. 125, 047204 (2020).
41. Collective Modes in Excitonic Insulators: Effects of Electron-Phonon Coupling and Signatures in Optical Response
Y. Murakami, D. Golez, T. Kaneko, A. Koga, A. J. Millis, and P. Werner, Phys. Rev. B 101, 195118 (2020).
42. Excitonic condensation reflecting electronic states in two-band Penrose-Hubbard model
K. Inayoshi, Y. Murakami, and A. Koga, J. Phys. Soc. Jpn. 89, 064002 (2020).
43. Ultrafast nonequilibrium evolution of excitonic modes in semiconductors
Y. Murakami, M. Schüler, S. Takayoshi and P. Werner, Phys. Rev. B 101, 035203 (2020).
44. Two-step gap opening across the quantum critical point in a Kitaev honeycomb magnet
Y. Nagai, T. Jinno, Y. Yoshitake, J. Nasu, Y. Motome, M. Itoh, and Y. Shimizu, Phys. Rev. B 101, 020414 (2020).
45. Spin transport in the Quantum Spin Liquid State in the S=1 Kitaev model: role of the fractionalized quasiparticles
A. Koga, T. Minakawa, Y. Murakami, and J. Nasu, J. Phys. Soc. Jpn. 89, 033701 (2020).
2019
46. Quantum Simulation Meets Nonequilibrium Dynamical Mean-Field Theory: Exploring the Periodically Driven, Strongly Correlated Fermi-Hubbard Model
K. Sandholzer, Y. Murakami, F. Görg, J. Minguzzi, M. Messer, R. Desbuquois, M. Eckstein, P. Werner, and T. Esslinger, Phys. Rev. Lett. 123, 193602 1-6 (2019).
47. Residual entropy and spin fractionalizations in the mixed-spin Kitaev model
A. Koga and J. Nasu, Phys. Rev. B 100, 100404 1-5 (2019).
48. Ferromagnetic Instability for single-band Hubbard model in the strong-coupling regime
Y. Kamogawa, J. Nasu, and A. Koga, Phys. Rev. B 99, 235107 1-6 (2019).
49. Low temperature properties in the Bilayer Kitaev model
H. Tomishige, J. Nasu, and A. Koga, Phys. Rev. B 99, 174424 1-5 (2019).
50. High-harmonic generation in quantum spin systems
S. Takayoshi, Y. Murakami, and P. Werner, Phys. Rev. B 99, 184303 1-18 (2019).
51. Quantum and classical behavior of spin-S Kitaev models in an anisotropic limit
T. Minakawa, J. Nasu, and A. Koga, Phys. Rev. B 99, 104408 1-8 (2019).
52. Staggered ordered phases in the three-orbital Hubbard model
K. Ishigaki, J. Nasu, A. Koga, S. Hoshino, and P. Werner, Phys. Rev. B 99, 085131 1-11 (2019).
53. Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field
K. Ishigaki, J. Nasu, and A. Koga, J. Phys. Soc. Jpn. 88, 024702 1-5 (2019).
2018
54. Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
K. Ishigaki, J. Nasu, A. Koga, S. Hoshino, and P. Werner, Phys. Rev. B 98, 235120 1-7 (2018).
55. Incipient and well-developed entropy plateaus in spin-S Kitaev models
J. Oitmaa, A. Koga, and R. R. P. Singh, Phys. Rev. B 98, 214404 1-6 (2018).
56. Successive Majorana Topological Transitions Driven by a Magnetic Field in the Kitaev Model
J. Nasu, Y. Kato, Y. Kamiya, and Y. Motome, Phys. Rev. B 98, 060416 1-6 (2018).
57. Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
Y. Kasahara, T. Ohnishi, Y. Mizukami, O. Tanaka, Sixiao Ma, K. Sugii, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, T. Shibauchi, and Y. Matsuda, Nature 559, 227-231 (2018).
58. Unusual Thermal Hall Effect in a Kitaev Spin Liquid Candidate α-RuCl3
Y. Kasahara, K. Sugii, T. Ohnishi, M. Shimozawa, M. Yamashita, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, T. Shibauchi, and Y. Matsuda, Phys. Rev. Lett. 120, 217205-1-6 (2018).
59. Magnetoelectric Effect in a Spin-State Transition System
M. Naka, E. Mizoguchi, J. Nasu, and S. Ishihara, J. Phys. Soc. Jpn. 87, 063709 1-5 (2018).
60. Ground-state and thermodynamic properties of an S=1 Kitaev model
A. Koga, H. Tomishige, and J. Nasu, J. Phys. Soc. Jpn. 87, 063703 1-4 (2018).
61. Role of spin-orbit coupling in the Kugel-Khomskii model on the honeycomb lattice
A. Koga, S. Nakauchi, and J. Nasu, Phys. Rev. B 97, 094427 1-5 (2018).
62. Charge Kondo Effect and Superconductivity in the Falikov-Kimball model with the Pair Hopping
R. Shinzaki, J. Nasu, and A. Koga, Phys. Rev. B 97, 125130 1-6 (2018).
63. Interlayer Coupling Effect on a Bilayer Kitaev Model
H. Tomishige, J. Nasu, and A. Koga, Phys. Rev. B 97, 094403 1-9 (2018).
2017
64. Chiral spin liquids at finite temperature in a three-dimensional Kitaev model
Y. Kato, Y. Kamiya, J. Nasu, and Y. Motome, Phys. Rev. B 96, 174409 1-7 (2017).
65. Antiferromagnetic order in the Hubbard Model on the Penrose Lattice
A. Koga and H. Tsunetsugu, Phys. Rev. B 96, 214402 1-17 (2017).
66. Thermal Transport in the Kitaev Model
J. Nasu, J. Yoshitake, and Y. Motome, Phys. Rev. Lett. 119, 127204 1-6 (2017).
67. Majorana fermions in the Kitaev quantum spin system α-RuCl3
S.-H. Do, S.-Y. Park, J. Yoshitake, J. Nasu, Y. Motome, Y. S. Kwon, D. T. Adroja, D. J. Voneshen, K. Kim, T.-H. Jang, J.-H. Park, K.-Y. Choi, and S. Ji, Nat. Phys. 13, 1079-1084 (2017).
68. Temperature evolution of spin dynamics in two- and three-dimensional Kitaev models: Influence of fluctuating Z2 flux
J. Yoshitake, J. Nasu, and Y. Motome, Phys. Rev. B 96, 064433-1-11 (2017).
69. Majorana dynamical mean-field study of spin dynamics at finite temperatures in the honeycomb Kitaev model
J. Yoshitake, J. Nasu, Y. Kato, and Y. Motome, Phys. Rev. B 96, 024438-1-21 (2017).
70. Spin-Liquid-to-Spin-Liquid Transition in Kitaev Magnets Driven by Fractionalization
J. Nasu, Y. Kato, J. Yoshitake, Y. Kamiya, and Y. Motome, Phys. Rev. Lett. 118, 137203 (2017).
71. Spontaneously symmetry breaking states in the attractive SU(N) Hubbard model
A. Koga and H. Yanatori, J. Phys. Soc. Jpn. 86, 034702 1-7 (2017).
72. Superconductivity on a Quasiperiodic Lattice: Extended-to-Localized Crossover of Cooper Pairs
S. Sakai, N. Takemori, A. Koga, and R. Arita, Phys. Rev. B 95, 024509 1-5 (2017).
2016
73. Fermionic response from fractionalization in an insulating two-dimensional magnet
J. Nasu, J. Knolle, D. L. Kovrizhin, Y. Motome, and R. Moessner, Nat. Phys. 12, 912-915 (2016).
74. Magnetic Response and Valence Fluctuations in the Extended Anderson Lattice Model with Quasiperiodicity
R. Shinzaki, J. Nasu, and A. Koga, J. Phys. Soc. Jpn. 85, 114706 1-6 (2016).
75. Fractional Spin Fluctuation as a Precursor of Quantum Spin Liquids: Majorana Dynamical Mean-Field Study for the Kitaev Model
J. Yoshitake, J. Nasu, and Y. Motome, Phys. Rev. Lett. 117, 157203 (2016).
76. Magnetic Field Effects in a Correlated Electron System with Spin-State Degree of Freedom -Implication of an Excitonic Insulator-
T. Tatsuno, E. Mizoguchi, J. Nasu, M. Naka, and S. Ishihara, J. Phys. Soc. Jpn. 85, 083706 (2016).
77. Finite Temperature Phase Transitions in the SU(N) Hubbard model
H. Yanatori and A. Koga, Phys. Rev. B 94, 041110 1-5 (2016).
78. Phase transitions in the Hubbard model for the bismuth nickelate
S. Kojima, J. Nasu, and A. Koga, Phys. Rev. B 94, 045103 1-6 (2016).
79. Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint
J. Nasu, T. Watanabe, M. Naka, and S. Ishihara, Phys. Rev. B 93, 205136 (2016).
80. Finite Temperature Properties of Three-Component Fermion Systems in Optical Lattice
H. Yanatori and A. Koga, J. Phys. Soc. Jpn. 85, 014002 1-5 (2016).
2015
81. Magnetic Three States of Matter: A Quantum Monte Carlo Study of Spin Liquids
Y. Kamiya, Y. Kato, J. Nasu, and Y. Motome, Phys. Rev. B 92, 100403 (2015).
82. Thermal fractionalization of quantum spins in a Kitaev model: Temperature-linear specific heat and coherent transport of Majorana fermions
J. Nasu, M. Udagawa, and Y. Motome, Phys. Rev. B 92, 115122 (2015).
83. Thermodynamics of Chiral Spin Liquids with Abelian and Non-Abelian Anyons
J. Nasu and Y. Motome, Phys. Rev. Lett. 115, 087203 1-5 (2015).
84. Transport properties for a quantum dot coupled to normal leads with pseudogap
B. Hara, A. Koga, and T. Aono, Phys. Rev. B 92, 081103 1-5 (2015).
85. Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
S. Takemura, N. Takemori, and A. Koga, Phys. Rev. B 91, 165114 1-6 (2015).
86. Superconductivity in the two-band Hubbard model
A. Koga and P. Werner, Phys. Rev. B 91, 085108 1-7 (2015).
87. Resonating Valence-Bond State in an Orbitally Degenerate Quantum Magnet with Dynamical Jahn-Teller Effect
J. Nasu and S. Ishihara, Phys. Rev. B 91, 045117 1-8 (2015).
88. Local Electron Correlations in a Two-dimensional Hubbard Model on the Penrose Lattice
N. Takemori, A. Koga, J. Phys. Soc. Jpn. 84, 023701 1-5 (2015).
2014
89. Vaporization of Kitaev spin liquids
J. Nasu, M. Udagawa, and Y. Motome, Phys. Rev. Lett. 113, 197205 1-5 (2014).
90. Spin-orbit coupling in octamers in the spinel sulfide CuIr2S4: Competition between spin-singlet and quadrupolar states and its relevance to remnant paramagnetism
J. Nasu and Y. Motome, Phys. Rev. B 90, 045102 1-12 (2014).
91. Stability of the Superfluid State in Three-Component Fermionic Optical Lattice Systems
Y. Okanami, N. Takemori and A. Koga, Phys. Rev. A 89, 053622 1-8 (2014).
92. Supersolid states in a hard-core Bose-Hubbard model on a layered triangular lattice
R. Suzuki and A. Koga, J. Phys. Soc. Jpn. 83, 064003 1-6 (2014).
2013
93. Quantum Monte Carlo study of nonequilibrium transport through a quantum dot coupled to normal and superconducting leads
A. Koga, Phys. Rev. B 87, 115409 1-7 (2013).
94. Mott transitions in the Hubbard model with spatially-modulated interactions
A. Koga, T. Saitou, and A. Yamamoto, J. Phys. Soc. Jpn. 82, 024401 1-8 (2013).
2012
95. Stability of FFLO states in optical lattices with bilayer structure
Y. Okawauchi and A. Koga, J. Phys. Soc. Jpn. 81, 074001 1-5 (2012).
96. Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice
N. Takemori and A. Koga, J. Phys. Soc. Jpn. 81, 063002 1-4 (2012).
97. A study on correlation effects in two dimensional topological insulators
Y. Tada, R. Peters, M. Oshikawa, A. Koga, N. Kawakami, and S. Fujimoto, Phys. Rev. B 85, 165138 1-18 (2012).
2011
98. Low temperature properties of the infinite-dimensional attractive Hubbard model
A. Koga and P. Werner, Phys. Rev. A 84, 023638 1-7 (2011).
2010
99. Superfluid state in the periodic Anderson model with attractive interactions
A. Koga and P. Werner, J. Phys. Soc. Jpn. 79, 114401 1-7 (2010).
100. Superfluid properties of ultracold fermionic atoms in two-dimensional optical lattices
Y. Fujihara, A. Koga and N. Kawakami, Phys. Rev. A 81, 063627 1-7 (2010).
101. Polarized Superfluidity in the Imbalanced Attractive Hubbard Model
A. Koga and P. Werner, J. Phys. Soc. Jpn. 79, 064401 1-6 (2010).
2009
102. Ferromagnetism of cold fermions loaded into a decorated square lattice
K. Noda, A. Koga, N. Kawakami, and Th. Pruschke, Phys. Rev. A 80, 063622 1-7 (2009).
103. Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice
T. Yoshioka, A. Koga, and N. Kawakami, Phys. Rev. Lett. 103, 036401 1-4 (2009).
〒152-8551 東京都目黒区大岡山2-12-1
東京工業大学 理学院 物理学系 古賀研究室