研究業績

国際会議

2026

Hyperuniform properties of aperiodic tilings
A. Koga
Twenty-Seventh Congress and General Assembly of the International Union of Crystallography
IUCr2026
Calgary, Canada · 2026/8/10-16
Stealthy hyperuniform bond disorder in the honeycomb Hubbard model
A. Koga
Past, Present and Future of Reverse Monte Carlo Modeling: Recent Challenges in Determining Structure - Property Relationship in Materials
Bad Honnef, Germany · 2026/7/27-31

2025

Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A DMFT study
A. Koga
The 17th TOYOTA RIKEN International Workshop Ruthenates and Emerging Quantum Materials
REQM2025
Kyoto · 2025/12/2-6
Critical hebavior of the Ising model on square-triangle tilings
A. Koga
Trends in the Theory of Quantum Materials
TTQM2025
Saitama · 2025/10/20-22
Critical hebavior of the Ising model on square-triangle tilings
A. Koga
The 29th International Conference on Statistical Physics
Statphys29
Florence, Italy · 2025/7/13-18
Hyperuniform properties of the square-triangle tilings
A. Koga, S. Sakai, Y. Matsushita, and T. Ishimasa
The 16th International Conference on Quasicrystals
ICQ16
Nancy, France · 2025/6/22-27

2024

Ferromagnetic instability for the SU(N) Hubbard model
J. Fujii and A. Koga
SU(N) physics in quantum many-body systems: theory, experiment, and numerics
SUN2024
Sendai · 2024/7/8-12
Majorana-mediated spin transport in the Kitaev model at finite temperatures
A. Koga
Internaltional Symposium on Quantum Electronics
TSQS2024
Ito International Research Center,Tokyo · 2024/2/13-16

2023

Hyperuniformity in the two-dimensional periodic and quasiperiodic lattices
A. Koga, and S. Sakai
International conference on complex orders in condensed matter: aperiodic order, local order, electronic order, hidden order
Evian, France · 2023/9/24-29
Hyperuniformity in the two-dimensional periodic and quasiperiodic lattices
A. Koga, and S. Sakai
Ihe 15th International Conference on Quasicrystals (ICQ15)
Tel Aviv, Israel · 2023/6/18-26
Hexagonal metallic-mean tilings as aperiodic approximants of the honeycomb lattice
T. Matsubara, A. Koga, and T. Dotera
Ihe 15th International Conference on Quasicrystals (ICQ15)
Tel Aviv, Israel · 2023/6/18-26

2022

Majorana-mediated spin transport in the S=1/2 Kitaev model at finite temperatures
H. Taguchi, Y. Murakami, and A. Koga
International Conference on Strongly Correlated Electron Systems (SCES2022)
Amsterdam, The Netherlands · 2022/7/24-29
Majorana-mediated spin transport in the S=1/2 Kitaev model at finite temperatures
A. Koga
11th International Conference on Highly Frustrated Magnetism 2022 (HFM22)
Paris, France · 2022/6/20-25
A 6-fold golden-mean tiling with four tiles
S. Coates, T. Matsubara, A.Koga
10th International Conference on Aperiodic Crystals (APERIODIC2022)
Sapporo, Japan · 2022/6/20-24

2019

Ferromagnetic Instability for the Single-band Hubbard Model in the Strong-Coupling Regime
A. Koga
14th Asia-Pacific Physics Conference (APPC2019)
Borneo Convention Centre Kuching, Malaysia · 2019/11/17-21
Low-temperature Properties of the generalized Kitaev Model
A. Koga
International Conference on Strongly Correlated Electron Systems (SCES2019)
Okayama, Japan · 2019/9/23-28

2018

Ground-state and Finite-temperature Properties of the Bilayer Kitaev model
H. Tomishige, J. Nasu, A. Koga
International Conference on Highly Frustrated Magnetism 2018 (HFM2018)
UC Davis, US · 2018/7/10-14
Ground-state and Finite-temperature Properties of the Bilayer Kitaev model
A. Koga, H. Tomishige, and J. Nasu
The 6th International Conference on Superconductivity and Magnetism (ICSM2018)
Beldibi/Antalya, Turkey · 2018/4/29-5/4

2017

Role of the spin-orbit coupling in the Kugel-Khomskii model on the honeycomb lattice
A. Koga
Inter-institutional meeting in Interdisciplinary Theoretical and Computational Physical Science (ITCPS2017)
Tokyo Institute of Technology, Tokyo · 2017/10/4-6
Role of the spin-orbit coupling in the Kugel-Khomskii model on the honeycomb lattice
A. Koga, S. Nakauchi, and J. Nasu
J-Physics 2017: International Workshop on Multipole Physics and Related Phenomena
Hachimantai, Iwate · 2017/9/24-28
Magnetic properties in the Penrose-Hubbard model
A. Koga and H. Tsunetsugu
28th International Conference on Low Temperature Physics (LT28)
Gothenburg, Sweden · 2017/8/9-16
Ground-state phase diagram in the Kugel-Khomskii model with finite spin-orbit interactions
A. Koga, S. Nakauchi, and J. Nasu
International Conference on Strongly Correlated Electron Systems (SCES2017)
Prague, Czech · 2017/7/17-21
Ground-state phase diagram in the Kugel-Khomskii model with finite spin-orbit interactions
A. Koga, S. Nakauchi, and J. Nasu
International Conference on Topological Materials Science 2017 (TopoMat2017)
Tokyo Institute of Technology, Japan · 2017/5/9-13

2015

Superconductivity in the degenerate Hubbard model
A. Koga
TMU International Symposium 2015
New Quantum Phases Emerging from Novel Crystal Structure
Tokyo Metropolitan University, Japan · 2015/9/24-25

2013

Nonequilibrium transport through a quantum dot coupled to normal and superconducting leads
A. Koga
The International Conference on Strongly Correlated Electron Systems (SCES13)
Tokyo, Japan · 2013/8/5-9
Valence Fluctuations in the Extended Periodic Anderson Model at Finite Temperatures
Y. Kojima and A. Koga
The 12th Asia Pacific Physics Conference (APPC12)
Chiba, Japan · 2013/7/14-19
Transport properties through a quantum dot coupled to normal and superconducting leads
A. Koga
The New Generation in Strongly Correlated Electron Systems (NGSCES2013)
Sestri Levante, Italy · 2013/7/1-5
Transport properties through a quantum dot coupled to normal and superconducting lead
A. Koga
International Conference Optical and Electrical Spectroscopy of Single Quantum Dots (SQD13)
Mallorca, Spain · 2013/3/10-12

2012

Transport properties through a quantum dot coupled to normal and superconducting leads
A. Koga
International Symposium Nanoscience and Quantum Physics (nanoPHYS'12)
Tokyo, Japan · 2012/12/17-19
Metal-Insulator transition in optical lattice system with site-dependent interactions
A. Koga, T. Saitou, and A. Yamamoto
International Conference on Superconductivity and Magnetism (ICSM 2012)
Istanbul, Turkey · 2012/4/29-5/4

2011

Superfluid state in the periodic Anderson model with attractive interactions
A. Koga and P. Werner
International Conference on Strongly Correlated Electron Systems (SCES 2011)
Cambridge, UK · 2011/8/29-9/3
Superfluid state in the periodic Anderson model with attractive interactions
A. Koga
International Symposium Nanoscience and Quantum Physics
nanoPHYS'11
Tokyo, Japan · 2011/1/26-28

2010

Polarized superfluid state in a fermionic optical lattice
A. Koga and P. Werner
International Conference on Frustrated Spin Systems, Cold Atoms, Nanomaterials
Hanoi, Vietnam · 2010/7/14-16
Polarized superfluid state in a fermionic optical lattice
A. Koga and P. Werner
International Conference on Strongly Correlated Electron Systems (SCES 2010)
Santa Fe, USA · 2010/6/27-7/2

2009

Phase Transitions in the Half-filled Hubbard Model on the Triangular Lattice
T. Yoshioka, A. Koga, and N. Kawakami
The 8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2009)
The 64th Yamada Conference
Niseko, Japan · 2009/9/12-17
Analysis of Superfluid State of Ultracold Fermions with Attractive Interactions in Two-dimensional Optical Lattices
Y. Fujihara, A. Koga, and N. Kawakami
9th International Conference on Materials and Mechanisms of Superconductivity (M2S-IX)
Tokyo, Japan · 2009/9/7-12
Quantum phase transitions in the Hubbard model on the triangular lattice
T. Yoshioka, A. Koga, and N. Kawakami
Quantum Criticality & Novel Phases (QCNP2009)
Dresden, Germany · 2009/8/2-5

2008

Supersolid state in a fermionic optical lattice system
A. Koga, T. Higashiyama, K. Inaba, S. Suga, and N. Kawakami
The 25th International Conference on Low Temperature Physics (LT25)
Amsterdam, Netherlands · 2008/8/7-13

2007

Phase transitions in the extended periodic Anderson model
A. Koga, N. Kawakami, R. Peters, and Th. Pruschke
The International Conference on Strongly Correlated Electron Systems (SCES2007)
Houston, USA · 2007/5/13-18

2006

Mott transitions in the Hubbard model on the planar pyrochlore lattice
A. Koga, T. Yoshioka, N. Kawakami, and H. Yokoyama
International Conference on Magnetism
Kyoto, Japan · 2006/8/20-25
Electron correlations in the Hubbard model on the planar pyrochlore lattice
A. Koga, T. Yoshioka, N. Kawakami and H. Yokoyama
8th International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductor
Dresden, Germany · 2006/7/9-14

2005

Variational Monte Carlo Study of Two Dimensional Multi-Orbital Hubbard Model
A. Koga, N. Kawakami, H. Yokoyama, and K. Kobayashi
The 24th International Conference on Low Temperature Physics (LT24)
Orlando, Florida, USA · 2005/8/10-17

2004

Mott transitions in the multiorbital systems
A. Koga, N. Kawakami, T.M. Rice, and M. Sigrist
The international conference on Strongly Correlated Electron Systems (SCES 2004)
Karlsruhe, Germany · 2004/7/26-30

2002

Effects of degenerate orbitals on the Anderson lattice model
A. Koga and N. Kawakami
The 3rd International Symposium on Advanced Science Research (ASR2002)
Advances in the Physics of f-electron systems
JAERI Tokai, Ibaraki · 2002/11/12-14
Quantum phase transitions in a frustrated orthogonal-dimer S=1 spin system
A. Koga and N. Kawakami
The 23rd International Conference on Low Temperature Physics (LT23)
International Conference Center, Hiroshima · 2002/8/20-27

2001

Hole-doping effects on a S=1 ladder system
A. Koga, N. Kawakami and M. Sigrist
The international conference on Strongly Correlated Electron System (SCES 2001)
Ann Arbor, Michigan, USA · 2001/8/6-10

2000

Quantum phase transitions for the three-dimensional orthogonal-dimer spin system
A. Koga and N. Kawakami
Conference on Computational Physics 2000 (CCP2000)
New Challenges for the New Millennium
Gold Coast, Queensland, Australia · 2000/12/3-8