Condensed Matter / Koga Lab.

Papers

Preprints

• Theory of clusterization in orbitally degenerate transition-metal compounds driven by lattice instabilities
  S. Ozaki, K. Mitsumoto, and C. Hotta, arXiv:2606.18014.
• Exact spectrum and anomalous relaxation in the open disorder-free Sachdev-Ye-Kitaev system
  S. Ozaki, H. Yoshida, and H. Katsura, arXiv:2606.08079.
• Stealthy hyperuniform disorder: A new route to controlling electric states and magnetic phase transition in correlated systems
  A. Koga and T. Sugimoto, arXiv:2604.19041.
• Orbital-Zeeman cross correlation in p- and d-wave altermagnets
  T. Mizoguchi and S. Ozaki, arXiv:2603.09325.
• Impact of Stealthy Hyperuniform Magnetic Impurity Configurations on Bulk Magnetism in a Two-dimensional Heisenberg Model
  K. Asakura, K. Yamamoto, and A. Koga, arXiv:2602.22484.
• Holographic Aspects of Dynamical Mean-Field Theory
  K. Okunishi and A. Koga, arXiv:2509.19704.

2026

• Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU(N) Fermi-Hubbard model
  J. Fujii, K. Yamamoto, and A. Koga, Phys. Rev. B 113, 115132 1-11 (2026).
• Elliptical-rod geometries enhance photonic band gaps in disordered stealthy hyperuniform photonic crystals
  K. Asakura, K. Yamamoto, and A. Koga, J. Phys. Soc. Jpn. 95, 024711 1-6 (2026).