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| 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, 003.1-003.7 (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 1-6 (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 1-6 (2023). |
| 4. |
A three tile 6-fold golden-mean tiling
S. Coates, T. Matsubara, and A. Koga, arXiv:2211.00127. |
| 5. |
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 1-8 (2023). |
| 2022 |
| 6. |
Photoinduced Phase Transition in Two-Band model on Penrose Tiling
K. Inayoshi, Y. Murakami, and A. Koga, J. Phys.: Conf. Ser. 2164, 012050 1-4 (2022). |
| 7. |
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 1-4 (2022). |
| 2021 |
| 8. |
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 |
| 9. |
Magnetic properties of the S = 1 Kitaev model with anisotropic interactions
T. Minakawa, J. Nasu, and A. Koga, JPS Conf. Proc. 30, 011086 1-6 (2020). |
| 2019 |
| 10. |
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). |
| 11. |
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). |
| 12. |
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 |
| 13. |
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 |
| 14. |
Cluster Size Effects on Electronic Reconstruction in Quasiperiodic System
R. Shinzaki, J. Nasu, and A. Koga, J. Phys.: Conf. Ser. 809, 012022 1-4 (2017). |
| 2016 |
| 15. |
DMFT Study for Valence Fluctuations in the Extended Periodic Anderson Model
R. Shinzaki, J. Nasu, and A. Koga, J. Phys.: Conf. Ser. 683, 012041 1-6 (2016). |
| 16. |
Intersite electron correlations in a Hubbard model on inhomogeneous lattices
N. Takemori, A. Koga, and H. Hafermann, J. Phys.: Conf. Ser. 683, 012040 1-6 (2016). |
| 2015 |
| 17. |
DMFT study of the local correlation effects in quasi-periodic system
N. Takemori and A. Koga, J. Phys.: Conf. Ser. 592, 012038 1-6 (2015). |
| 18. |
Diagrammatic Quantum Monte Carlo Study of Nonequilibrium Transport through a Quantum Dot coupled to Normal and Superconducting Leads
A. Koga, JPS Conf. Proc. 4, 011003 1-4 (2015). |
| 19. |
Stabilities of Superfluid and Density Wave States in Fermionic Mass Imbalanced Optical Lattices
N. Takemori and A. Koga, JPS Conf. Proc. 4, 011006 1-4 (2015). |
| 2014 |
| 20. |
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 1-6 (2014). |
| 21. |
Nonequilibrium transport through a quantum dot coupled to normal and superconducting leads
A. Koga, JPS Conf. Proc. 3, 012018 1-6 (2014). |
| 22. |
Valence Fluctuations in the Extended Periodic Anderson Model at Finite Temperatures
Y. Kojima and A. Koga, JPS Conf. Proc. 1, 012106 1-4 (2014). |
| 2013 |
| 23. |
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 |
| 24. |
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 |
| 25. |
Superfluid state in the periodic Anderson model with attractive interactions
A. Koga and P. Werner, J. Phys.: Conf. Ser. 302, 012040 1-6 (2011). |
| 26. |
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). |
| 27. |
Pseudogap behavior in the infinite dimensional attractive Hubbard model
A. Koga and P. Werner, Mod. Phys. Lett. B 25, 973-978 (2011). |
| 28. |
Polarized superfluid state in a three-dimensional fermionic optical lattice
A. Koga, J. Bauer, P. Werner, Th. Pruschke, Physica E 43, 697-701 (2011). |
| 2010 |
| 29. |
Analysis of superfluid state of ultracold fermions with attractive interactions in two-dimensional optical lattices
Y. Fujihara, A. Koga, and N. Kawakami, Physica C 470, S991-S992 (2010). |
| 30. |
Magnetic transition in the Hubbard model on the triangular lattice
T. Yoshioka, A. Koga, and N. Kawakami, Physica B 405, S179-S181 (2010). |
| 31. |
Mott transition in the Hubbard model on the triangular lattice
T. Yoshioka, A. Koga, and N. Kawakami, Phys. Status Solidi B 247, 635-637 (2010). |
| 32. |
Magnetically Ordered State of Cold Fermions on a Decorated Square Lattice
K. Noda, A. Koga, N. Kawakami and Th. Pruschke, J. Low Temp. Phys. 158, 79-84 (2010). |
| 2009 |
| 33. |
Superfluidity and magnetism in two-dimensional fermionic optical lattice systems
Y. Fujihara, A. Koga, and N. Kawakami, Physica B 404, 3324-3327 (2009). |
| 34. |
Magnetic and Orbital Properties of the two-band Hubbard Model with Different Bandwidths
Y. Koyama, A. Koga, N. Kawakami, and P. Werner, Physica B 404, 3267-3270 (2009). |
| 35. |
Supersolid state in a fermionic optical lattice system
A. Koga, T. Higashiyama, K. Inaba, S. Suga and N. Kawakami, J. Phys.: Conf. Ser. 150, 032046 1-4 (2009). |
| 36. |
Mott insulating state in a quarter-filled two-orbital Hubbard chain with different bandwidths
S. Miyashita, Y. Yamashita, K. Yonemitsu, A. Koga, and N. Kawakami, J. Phys.: Conf. Ser. 150, 042128 1-4 (2009). |
| 37. |
Zero-temperature Phase Diagram of Two Dimensional Hubbard Model
K. Inaba, A. Koga, S. Suga, and N. Kawakami, J. Phys.: Conf. Ser. 150, 042066 1-4 (2009). |
| 2008 |
| 38. |
Variational Monte Carlo analysis of singlet-pairing state in a system with inhomogeneous potential
Y. Fujihara, A. Koga, and N. Kawakami, J. phys. Chem. Solid 69, 3388-3391 (2008). |
| 39. |
Instability of plaquette valence-bond crystal phase in planar pyrochlore electron system
T. Yoshioka, A. Koga, and N. Kawakami, Physica B 403, 1248-1250 (2008). |
| 40. |
Phase transitions in the extended periodic Anderson model
A. Koga, N. Kawakami, R. Peters, and Th. Pruschke, Physica B 403, 1378-1380 (2008). |
| 2007 |
| 41. |
Electron correlations in the Hubbard model on the planar pyrochlore lattice
A. Koga, T. Yoshioka, N. Kawakami, H. Yokoyama, Physica C 460-462, 1070-1071 (2007). |
| 42. |
Mott transition of correlated electrons on the Kagome lattice
S. Kuratani, A. Koga, N. Kawakami, J. Phys. Condens. Matter 19, 145252 1-5 (2007). |
| 43. |
Superconductivity in non-centrosymmetric materials
M. Sigrist, D. F. Agterberg, P. A. Frigeri, N. Hayashi, R. P. Kaur, A. Koga, I. Milat, K. Wakabayashi, Y. Yanase, J. Mag. Mag. Mat. 310, 536-540 (2007). |
| 44. |
Quantum Phase Transitions in the Hubbard Model on the Planar Pyrochlore Lattice
A. Koga, T. Yoshioka, N. Kawakami, H. Yokoyama, J. Mag. Mag. Mat. 310, 867-869 (2007). |
| 45. |
Systematic Analysis of the Hubbard Model on the Checkerboard Lattice
T. Yoshioka, A. Koga, and N. Kawakami, J. Mag. Mag. Mat. 310, 873-875 (2007). |
| 46. |
Variational Monte Carlo Study of Hubbard Model with Harmonic Confinement
Y. Fujihara, A. Koga, and N. Kawakami, J. Mag. Mag. Mat. 310, 882-884 (2007). |
| 47. |
Thermodynamic properties of the two-orbital Hubbard Model
K. Inaba, A. Koga, S. Suga, and N. Kawakami, J. Mag. Mag. Mat. 310, 876-878 (2007). |
| 48. |
Quantum Monte Carlo Study of Impurity Anderson Models with Degenerate Orbitals
Y. Koyama, A. Koga, and N. Kawakami, J. Mag. Mag. Mat. 310, 405-407 (2007). |
| 2006 |
| 49. |
Variational Monte Carlo Study of Two Dimensional Multi-Orbital Hubbard Model
A. Koga, N. Kawakami, H. Yokoyama, and K. Kobayashi, AIP Conf. Proc. 850, 1458-1459 (2006). |
| 50. |
Magnetic fields and superconductivity without inversion symmetry in CePt3Si
D. F. Agterberg, P. A. Frigeri, R. P. Kaur, A. Koga and M. Sigrist, Physica B 378-380, 351-354 (2006). |
| 51. |
Analysis of checkerboard electron system by path-integral renormalization group method
T. Yoshioka, A. Koga, and N. Kawakami, Physica B 378-380, 294-296 (2006). |
| 2005 |
| 52. |
Mott transitions in two-orbital Hubbard systems
A. Koga, K. Inaba, and N. Kawakami, Prog. Theor. Phys. Suppl. 160, 253-273 (2005). |
| 53. |
Mott transitions in the multi-orbtial systems
A. Koga, N. Kawakami, T.M. Rice, and M. Sigrist, Physica B 359-361, 1366-1368 (2005). |
| 54. |
Field-induced phase transition in the periodic Anderson model
T. Ohashi, A. Koga, S. Suga, and N. Kawakami, Physica B 359-361, 738-740 (2005). |
| 55. |
Superconductivity without inversion symmetry in CePt3Si
P. Frigeri, D. F. Agterberg, A. Koga, M. Sigrist, Physica B 359-361, 371-373 (2005). |
| 2003 |
| 56. |
Effect of degenerate orbitals on the Anderson lattice model
A. Koga and N. Kawakami, J. Phys. Condens. Matter 15, S2215-S2218 (2003). |
| 57. |
Quantum phase transitions in a frustrated orthogonal-dimer S=1 spin system
A. Koga and N. Kawakami, Physica B 329-333, 1267-1268 (2003). |
| 2002 |
| 58. |
Magnetization curves of quasi-one-dimensional haldane systems
A. Kawaguchi, A. Koga, N. Kawakami and K. Okunishi, Int. J. Mod. Phys. B 16, 3339-3342 (2002). |
| 59. |
Hole-doping effects on an S=1 ladder system
A. Koga, N. Kawakami and M. Sigrist, Physica B 312-313, 606-608 (2002). |
| 60. |
Hole-doping effects on orthogonal-dimer spin chain
A. Kawaguchi, A. Koga, K. Okunishi and N. Kawakami, J. phys. Chem. Solid 63, 1431-1434 (2002). |
| 61. |
First-Order Phase Transitions in Frustrated Spin Systems
A. Koga, A. Kawaguchi, K. Okunishi and N. Kawkami, Prog. Theor. Phys. Suppl. 145, 52-57 (2002). |
| 62. |
Quantum phase competition in antiferromagnetic spin-1 ladders
S. Yamamoto, T. Sakai, and A. Koga, Prog. Theor. Phys. Suppl. 145, 176-181 (2002). |
| 2001 |
| 63. |
Quantum phase transitions for the three-dimensional orthogonal-dimer spin system
A. Koga and N. Kawakami, Comp. Phys. Comm. 142, 172-175 (2001). |
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