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原著論文All papers

	Preprint
1.	Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperature: A DMFT study, J. Fujii, K. Yamamoto, and A. Koga, arXiv:2505.12704.
2.	Spin-Depairing-Induced Exceptional Fermionic Superfluidity, S. Takemori, K. Yamamoto, and A. Koga, arXiv:2504.19525.
3.	Modulated honeycomb lattices and their magnetic properties, A. Koga and T. Matsubara, arXiv:2504.16583.
4.	Measurement-induced phase transitions for free fermions in a quasiperiodic potential, T. Matsubara, K. Yamamoto and A. Koga, arXiv:2503.23807.
5.	Intersite electron correlations on inhomogeneous lattices: a real-space dual fermion approach, N. Takemori, A. Koga, and H. Hafermann, arXiv:1801.02441.
	2025
6.	Triangular and dice quasicrystals modulated by generic 1D aperiodic sequences, T. Matsubara, A. Koga and T. Dotera, Phys. Rev. B 111, 104104 (2025).
7.	Critical behavior of the Ising model on square-triangle tilings, A. Koga and S. Sakai, Phys. Rev. B 111, 014429 (2025).
	2024
8.	Phase diagram of non-Hermitian BCS superfluids in a dissipative asymmetric Hubbard model, S. Takemori, K. Yamamoto, and A. Koga, Phys. Rev. B 110, 184518 (2024).
9.	Hyperuniform properties of the square-triangle tilings, A. Koga, S. Sakai, Y. Matsushita, and T. Ishimasa, Phys. Rev. B 110, 094208 (2024).
10.	Hexagonal and trigonal quasiperiodic tilings, S. Coates, A. Koga, T. Matsubara, R. Tamura, H. R. Sharma, R. McGrath, and R. Lifshitz, Isr. J. Chem , e202300100 (2024).
11.	Aperiodic approximants bridging quasicrystals and modulated structures, T. Matsubara, A. Koga, A. Takano, Y. Matsushita, and T. Dotera, Nat. Comm. 15, 5742 (2024).
12.	Hyperuniformity in two-dimensional periodic and quasiperiodic point patterns, A. Koga and S. Sakai, Phys. Rev. E 109, 044103 1-10 (2024).
13.	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).
14.	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
15.	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).
16.	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).
17.	Quantum algorithm for the microcanonical Thermal Pure Quantum method, K. Mizukami and A. Koga, Phys. Rev. A 108, 012404 1-10 (2023).
18.	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
19.	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).
20.	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).
21.	Scattering phenomena for spin transport in Kitaev spin liquid, J. Nasu, Y. Murakami, and A. Koga, Phys. Rev. B 106, 024411 1-15 (2022).
22.	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).
23.	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).
24.	Photoinduced dynamics of a quasicrystalline excitonic insulator, K. Inayoshi, Y. Murakami, and A. Koga, Phys. Rev. B 105, 104307 1-13 (2022).
	2021
25.	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 1-8 (2021).
26.	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).
27.	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).
28.	Antiferromagnetically ordered state in the half-filled Hubbard model on the Socolar dodecagonal tiling, A. Koga, Mater. Trans. 62, 360-366 (2021).
29.	Effect of Electron-Electron Interactions on Metallic State in Quasicrystals, S. Sakai and A. Koga, Mater. Trans. 62, 380-385 (2021).
30.	High-harmonic generation in one-dimensional Mott insulator, Y. Murakami, S. Takayoshi, A. Koga, and P. Werner, Phys. Rev. B 103, 035110 1-14 (2021).
	2020
31.	Superlattice structure in the antiferromagnetically ordered state in the Hubbard model on the Ammann-Beenker tiling, A. Koga, Phys. Rev. B 102, 115125 1-10 (2020).
32.	Majorana-mediated spin transport in Kitaev quantum spin liquids, T. Minakawa, Y. Murakami, A. Koga, and J. Nasu, Phys. Rev. Lett. 125, 047204 1-7 (2020).
33.	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 1-17 (2020).
34.	Excitonic condensation reflecting electronic states in two-band Penrose-Hubbard model, K. Inayoshi, Y. Murakami, and A. Koga, J. Phys. Soc. Jpn. 89, 064002 1-8 (2020).
35.	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 1-4 (2020).
	2019
36.	Residual entropy and spin fractionalizations in the mixed-spin Kitaev model, A. Koga and J. Nasu, Phys. Rev. B 100, 100404 1-5 (2019).
37.	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).
38.	Low temperature properties in the Bilayer Kitaev model, H. Tomishige, J. Nasu, and A. Koga, Phys. Rev. B 99, 174424 1-5 (2019).
39.	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).
40.	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).
41.	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
42.	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).
43.	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).
44.	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).
45.	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).
46.	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).
47.	Interlayer Coupling Effect on a Bilayer Kitaev Model, H. Tomishige, J. Nasu, and A. Koga, Phys. Rev. B 97, 094403 1-9 (2018).
	2017
48.	Antiferromagnetic order in the Hubbard Model on the Penrose Lattice, A. Koga and H. Tsunetsugu, Phys. Rev. B 96, 214402 1-17 (2017).
49.	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).
50.	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
51.	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).
52.	Finite Temperature Phase Transitions in the SU(N) Hubbard model, H. Yanatori and A. Koga, Phys. Rev. B 94, 041110 1-5 (2016).
53.	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).
54.	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
55.	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).
56.	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).
57.	Superconductivity in the two-band Hubbard model, A. Koga and P. Werner, Phys. Rev. B 91, 085108 1-7 (2015).
58.	Local Electron Correlations in a Two-dimensional Hubbard Model on the Penrose Lattice, N. Takemori and A. Koga, J. Phys. Soc. Jpn. 84, 023701 1-5 (2015).
	2014
59.	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).
60.	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
61.	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).
62.	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
63.	Stability of FFLO states in optical lattices with bilayer structure, Y. Okawauchi and A. Koga, J. Phys. Soc. Jpn. 81, 074001 1-5 (2012).
64.	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).
65.	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
66.	Low temperature properties of the infinite-dimensional attractive Hubbard model, A. Koga and P. Werner, Phys. Rev. A 84, 023638 1-7 (2011).
	2010
67.	Superfluid state in the periodic Anderson model with attractive interactions, A. Koga and P. Werner, J. Phys. Soc. Jpn. 79, 114401 1-7 (2010).
68.	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).
69.	Polarized Superfluidity in the Imbalanced Attractive Hubbard Model, A. Koga and P. Werner, J. Phys. Soc. Jpn. 79, 064401 1-6 (2010).
	2009
70.	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).
71.	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).
72.	Supersolid state in fermionic optical lattice systems, A. Koga, T. Higashiyama, K. Inaba, S. Suga and N. Kawakami, Phys. Rev. A 79, 013607 1-6 (2009).
73.	Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions, Y. Fujihara, A. Koga, and N. Kawakami, Phys. Rev. A 79, 013610 1-7 (2009).
	2008
74.	Frustration effects in an anisotropic checkerboard lattice Hubbard model, T. Yoshioka, A. Koga, and N. Kawakami, Phys. Rev. B 78, 165113 1-6 (2008).
75.	Mott Transition in the Hubbard Model on Checkerboard Lattice, T. Yoshioka, A. Koga, and N. Kawakami, J. Phys. Soc. Jpn. 77, 104702 1-7 (2008).
76.	Supersolid state of ultracold fermions in an optical lattice, A. Koga, T. Higashiyama, K. Inaba, S. Suga, and N. Kawakami, J. Phys. Soc. Jpn. 77, 073602 1-4 (2008).
77.	Magnetic properties of the extended periodic Anderson model, A. Koga, N. Kawakami, R. Peters, and Th. Pruschke, J. Phys. Soc. Jpn. 77, 033704 1-4 (2008).
78.	Quantum phase transitions in the extended periodic Anderson model, A. Koga, N. Kawakami, R. Peters, and Th. Pruschke, Phys. Rev. B 77, 045120 1-7 (2008).
	2007
79.	Metal-insulator transition in the two-orbital Hubbard model at fractional band fillings: Self-energy functional approach, K. Inaba and A. Koga, J. Phys. Soc. Jpn. 76, 094712 1-7 (2007).
80.	Variational Monte Carlo Analysis of Hubbard Model with Confining Potential: One-Dimensional Fermionic Optical Lattice Systems, Y. Fujihara, A. Koga, N. Kawakami, J. Phys. Soc. Jpn. 76, 034716 1-8 (2007).
	2006
81.	Phase Diagrams of the Two-Orbital Hubbard Model with Different Bandwidths, K. Inaba and A. Koga, Phys. Rev. B 73, 155106 1-8 (2006).
	2005
82.	Phase diagram of orbital-selective Mott transitions at finite temperatures, K. Inaba, A. Koga, S. Suga, and N. Kawakami, J. Phys. Soc. Jpn. 74, 2393-2396 (2005).
83.	Finite-temperature Mott transitions in multi-orbital Hubbard model, K. Inaba, A. Koga, S. Suga, and N. Kawakami, Phys. Rev. B 72, 085112 1-7 (2005).
84.	Spin, charge, and orbital fluctuations in a multiorbital Mott insulator, A. Koga, N. Kawakami, T.M. Rice and M. Sigrist, Phys. Rev. B 72, 045128 1-8 (2005).
	2004
85.	Field-induced Phase transitions in the Kondo Insulator, T. Ohashi, A. Koga, S. Suga, and N. Kawakami, Phys. Rev. B 70, 245104 1-6 (2004).
86.	Periodic Anderson Model with Degenerate Orbitals: Linearized Dynamical Mean Field Theory Approach, R. Sato, T. Ohashi, A. Koga, and N. Kawakami, J. Phys. Soc. Jpn. 73, 1864-1869 (2004).
87.	Frustrated Ising model on the garnet lattice, T. Yoshioka, A. Koga and N. Kawakami, J. Phys. Soc. Jpn. 73, 1805-1811 (2004).
88.	Orbital-selective Mott transitions in the degenerate Hubbard model, A. Koga, N. Kawakami, T.M. Rice and M. Sigrist, Phys. Rev. Lett. 92, 216402 1-4 (2004).
89.	Hole Dynamics in the Orthogonal-Dimer Spin System, Y. Saito, A. Koga and N. Kawakami, J. Phys. Soc. Jpn. 73, 687-693 (2004).
90.	Superconductivity without inversion symmetry: MnSi versus $ CePt_3Si$, P. Frigeri, D. F. Agterberg, A. Koga and M. Sigrist, Phys. Rev. Lett. 92, 097001 1-4 (2004).
	2003
91.	Effects of Degenerate Orbitals on the Hubbard model, A. Koga, T. Ohashi, Y. Imai, S. Suga and N. Kawakami, J. Phys. Soc. Jpn. 72, 1306-1307 (2003).
92.	Hole-Doping Effects on a Two-Dimensional Kondo Insulator, Y. Saito, A. Koga and N. Kawakami, J. Phys. Soc. Jpn. 72, 1208-1215 (2003).
93.	Quantum Phase Transitions of the S=1 Shastry-Sutherland Model, A. Koga, N. Kawakami and M. Sigrist, J. Phys. Soc. Jpn. 72, 938-942 (2003).
94.	Hole-Doping Effects on a Frustrated Spin Ladder, A. Kawaguchi, A. Koga, K. Okunishi and N. Kawakami, J. Phys. Soc. Jpn. 72, 405-410 (2003).
	2002
95.	Stability of a metallic state in the two-orbital Hubbard model, A. Koga, Y. Imai and N. Kawakami, Phys. Rev. B 66, 165107 1-6 (2002).
96.	Frustration-induced phase transitions in the spin-S orthogonal-dimer chain, A. Koga and N. Kawakami, Phys. Rev. B 65, 214415 1-5 (2002).
97.	Re-Entrant Quantum Phase Transitions in Antiferromagnetic Spin-1 Ladders, S. Yamamoto, T. Sakai and A. Koga, J. Phys. Soc. Jpn. 71, 1250-1253 (2002).
98.	Magnetization process for a quasi-one-dimensional S=1 antiferromagnet, A. Kawaguchi, A. Koga, K. Okunishi and N. Kawakami, Phys. Rev. B 65, 214405 1-5 (2002).
99.	Quasi-one dimensional Haldane gap systems with single-ion anisotropy, A. Koga, Phys. Lett. A 296, 243-249 (2002).
	2001
100.	Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions, Y. Takushima, A. Koga and N. Kawakami, J. Phys. Soc. Jpn. 70, 1369-1374 (2001).
101.	Frustrated Heisenberg antiferromagnet on the pyrochlore lattice, A. Koga and N. Kawakami, Phys. Rev. B 63, 144432 1-5 (2001).
	2000
102.	Ground-State Phase Diagram for the Three-Dimensional Orthogonal-Dimer System, A. Koga, J. Phys. Soc. Jpn. 69, 3509-3512 (2000).
103.	First-order quantum phase transition in the orthogonal-dimer spin chain, A. Koga, K. Okunishi and N. Kawakami, Phys. Rev. B 62, 5558-5563 (2000).
104.	Phase Diagram for Two-Dimensional Spin Systems with Ladder, Plaquette and Mixed-Spin Structures, A. Koga and N. Kawakami, J. Phys. Soc. Jpn. 69, 1834-1836 (2000).
105.	Magnetic Double Structure for S=1 and 1/2 Mixed-Spin Systems, Y. Takushima, A. Koga and N. Kawakami, Phys. Rev. B 61, 15189-15195 (2000).
106.	Quantum phase transitions in the Shastry-Sutherland model for SrCu₂(BO₃)₂, A. Koga and N. Kawakami, Phys. Rev. Lett. 84, 4461-4464 (2000).
107.	Quantum phase transitions for the Haldane system in higher dimensions: A mixed-spin cluster expansion approach, A. Koga and N. Kawakami, Phys. Rev. B 61, 6133-6137 (2000).
	1999
108.	Quantum Phase Transitions in Two-Dimensional Spin Systems with Ladder, Plaquette and Mixed-Spin Structures, A. Koga, S. Kumada and N. Kawakami, J. Phys. Soc. Jpn. 68, 2373-2379 (1999).
109.	Two-Dimensional Quantum Spin Systems with Ladder and Plaquette Structures, A. Koga, S. Kumada and N. Kawakami, J. Phys. Soc. Jpn. 68, 642-649 (1999).
	1998
110.	Mixed-Spin Ladders and Plaquette Spin Chains, A. Koga, S. Kumada, N. Kawakami and T. Fukui, J. Phys. Soc. Jpn. 67, 622-628 (1998).

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