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
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研究内容
発表論文
会 議 録
解 説
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国際会議
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受 賞
2023
1. Efficient Scheme for Time-dependent Thermal Pure Quantum State: Application to the Kitaev Model with Armchair Edges
H. Taguchi, A. Koga, and Y. Murakami, SciPost Phys. Proc. 11, 003 (2023).
2. High-harmonic generation in the Rice-Mele model: Role of intraband current originating from interband transition
K. Nagai, Y. Murakami, and A. Koga, JPS Conf. Proc. 38, 011172 (2023).
3. Field-direction Dependence of Majorana-mediated Spin Transport
H. Taguchi, A. Koga, Y. Murakami, J. Nasu, and H. Tsuchiura, JPS Conf. Proc. 38, 011152 (2023).
4. Confined states in the tight-binding model on the hexagonal golden-mean tiling
T. Matsubara, A. Koga, and S. Coates, J. Phys.: Conf. Ser. 2461, 012003 (2023).
2022
5. Photoinduced Phase Transition in Two-Band model on Penrose Tiling
K. Inayoshi, Y. Murakami, and A. Koga, J. Phys.: Conf. Ser. 2164, 012050 (2022).
6. Majorana excitations in the anisotropic Kitaev model with an ordered-flux structure
A. Hashimoto, Y. Murakami, and A. Koga, J. Phys.: Conf. Ser. 2164, 012028 (2022).
2021
7. Ferromagnetically ordered metal in the single-band Hubbard model
A. Koga, Y. Kamogawa, and J. Nasu, AIP Conf. Proc. 2319, 130001 1-4 (2021).
2020
8. Magnetic properties of the S = 1 Kitaev model with anisotropic interactions
T. Minakawa, J. Nasu, and A. Koga, JPS Conf. Proc. 30, 011086 (2020).
2019
9. Magnetic properties in the metallic magnets with large anisotropy
Y. Taguchi, J. Nasu, A. Koga, T. Yoshioka, and H. Tsuchiura, J. Low Temp. Phys. 196, 321-326 (2019).
10. Quasiperiodicity and valence fluctuation in the spin-1/2 Falicov-Kimball model
J. Nasu, R. Shinzaki, and A. Koga, J. Low Temp. Phys. 196, 155-162 (2019).
11. Ground-state properties for bilayer Kitaev model: dimer expansion study
A. Koga, H. Tomishige, and J. Nasu, J. Supercond. Nov. Magn. 32, 1827-1830 (2019).
2018
12. Ground-state phase diagram in the Kugel-Khomskii model with finite spin-orbit interactions
A. Koga, S. Nakauchi, and J. Nasu, Physica B 536, 369-371 (2018).
2017
13. Cluster Size Effects on Electronic Reconstruction in Quasiperiodic System
R. Shinzaki, J. Nasu, and A. Koga, J. Phys.: Conf. Ser. 809, 012022 (2017).
2016
14. DMFT Study for Valence Fluctuations in the Extended Periodic Anderson Model
R. Shinzaki, J. Nasu, and A. Koga, J. Phys.: Conf. Ser. 683, 012041 (2016).
15. Intersite electron correlations in a Hubbard model on inhomogeneous lattices
N. Takemori, A. Koga, and H. Hafermann, J. Phys.: Conf. Ser. 683, 012040 (2016).
16. Spin correlation and Majorana spectrum in chiral spin liquids in a decorated-honeycomb Kitaev model
J. Nasu and Y. Motome, J. Phys.: Conf. Ser. 683, 012037 (2016).
2015
17. Phase Diagram of the Kitaev-type Model on a Decorated Honeycomb Lattice in the Isolated Dimer Limit
J. Nasu and Y. Motome, Phys. Procedia 75, 755-762 (2015).
18. Low-energy Majorana states in spin-liquid transitions in a three-dimensional Kitaev model
J. Nasu, M. Udagawa, Y. Motome, J. Phys.: Conf. Ser. 592, 012115 (2015).
19. DMFT study of the local correlation effects in quasi-periodic system
N. Takemori and A. Koga, J. Phys.: Conf. Ser. 592, 012038 (2015).
20. Diagrammatic Quantum Monte Carlo Study of Nonequilibrium Transport throug h a Quantum Dot coupled to Normal and Superconducting Leads
A. Koga, JPS Conf. Proc. 4, 011003 (2015).
21. Stabilities of Superfluid and Density Wave States in Fermionic Mass Imbalanced Optical Lattices
N. Takemori and A. Koga, JPS Conf. Proc. 4, 011006 (2015).
2014
22. Cluster mean-field approach with density matrix renormalization group: Application to the hard-core bosonic Hubbard model on a triangular lattice
R. Suzuki and A. Koga, JPS Conf. Proc. 3, 016005 (2014).
23. Nonequilibrium transport through a quantum dot coupled to normal and superconducting leads
A. Koga, JPS Conf. Proc. 3, 012018 (2014).
24. Valence Fluctuations in the Extended Periodic Anderson Model at Finite Temperatures
Y. Kojima and A. Koga, JPS Conf. Proc. 1, 012106 (2014).
2013
25. Metal-Insulator transition in optical lattice system with site-dependent interactions
T. Saitou, A. Koga and A. Yamamoto, J. Supercond. Nov. Magn. 26, 1771-1774 (2013).
2012
26. Dynamical properties of ultracold fermions with attractive interactions in an optical lattice
A. Koga and P. Werner, J. Phys.: Conf. Ser. 391, 012144 1-4 (2012).
2011
27. Superfluid state in the periodic Anderson model with attractive interactions
A. Koga and P. Werner, J. Phys.: Conf. Ser. 302, 012040 1-6 (2011).
28. Superfluid gap formation in a fermionic optical lattice with spin imbalanced populations
A. Koga and P. Werner, J. Phys.: Conf. Ser. 273, 012116 1-4 (2011).
29. Pseudogap behavior in the infinite dimensional attractive Hubbard model
A. Koga and P. Werner, Mod. Phys. Lett. B 25, 973-978 (2011).
30. Polarized superfluid state in a three-dimensional fermionic optical lattice
A. Koga, J. Bauer, P. Werner, Th. Pruschke, Physica E 43, 697-701 (2011).
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東京工業大学 理学院 物理学系 古賀研究室