732 citations · 3.5k across the 122 of their papers we have counts for
122 papers
Hyperuniformity in two-dimensional periodic and quasiperiodic point patterns
A. Koga, S. Sakai
We study hyperuniform properties in various two-dimensional periodic and quasiperiodic point patterns. Using the histogram of the two-point distances, we develop an efficient metho…
Theory of non-Hermitian fermionic superfluidity on a honeycomb lattice: Interplay between exceptional manifolds and van Hove Singularity
Soma Takemori, Kazuki Yamamoto, Akihisa Koga
We study the non-Hermitian fermionic superfluidity subject to dissipation of Cooper pairs on a honeycomb lattice, for which we analyze the attractive Hubbard model with a complex-v…
Energy flow during relaxation in an electron-phonon system with multiple modes: A nonequilibrium Green's function study
Ken Inayoshi, Akihisa Koga, Yuta Murakami
We investigate an energy flow in an extended Holstein model describing electron systems coupled to hot-phonons and heat-bath phonons. To analyze the relaxation process after the ph…
Ferromagnetically ordered states in the Hubbard model on the hexagonal golden-mean tiling
Toranosuke Matsubara, Akihisa Koga, Sam Coates
We study magnetic properties of the half-filled Hubbard model on the two-dimensional hexagonal golden-mean quasiperiodic tiling. The tiling is composed of large and small…
Majorana Gap Formation in the Anisotropic Kitaev Model with Ordered Flux Configuration
Akihiro Hashimoto, Yuta Murakami, Akihisa Koga
We study the Kitaev model with direction dependent interactions to investigate how the flux configuration and/or the anisotropy in the exchanges affect the Majorana excitations. Sy…
Efficient Control of High Harmonic Generation in Carbon Nanotubes using the Aharonov-Bohm Effect
Yuta Murakami, Kohei Nagai, Akihisa Koga
We show that high-harmonic generation (HHG) in carbon nanotubes (CNTs) can be efficiently controlled using the Aharanov-Bohm (AB) effect. When a static magnetic field (B) is applie…