3 papers
cond-mat.str-el2026
Floquet-Weyl states at one-photon resonances in three-dimensional topological insulators
Keiya Uehara, Ryo Okugawa, Takami Tohyama +1
Quantum materials exhibit exotic phases and electronic responses under irradiation by circularly polarized light, which breaks time-reversal symmetry and generates Floquet replica…
cond-mat.mes-hall2026
Chern insulators and topological flat bands in cavity-embedded kagome systems
Hikaru Goto, Ryo Okugawa, Takami Tohyama
We investigate topological band structures of a kagome system coupled to a circularly polarized cavity mode, using a model based on a muffin-tin potential and quantum light-matter…
cond-mat.supr-con2025
Gapless superconductivity and its real-space topology in quasicrystals
Kazuma Saito, Masahiro Hori, Ryo Okugawa +2
We study superconductivity in Ammann-Beenker quasicrystals under magnetic field. By assuming an intrinsic -wave pairing interaction and solving for mean-field equations self-con…