293 citations · 4.5k across the 188 of their papers we have counts for
190 papers
Topological Superconducting Phases in a Strained Altermagnet-Superconductor Heterostructure
Keita Yoshizawa, Ryo Okugawa, Takami Tohyama
We investigate topological superconductivity in a heterostructure consisting of a two-dimensional -wave superconductor and a -wave altermagnet with Rashba spin-orbit coupling…
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…
Thermoelectric and Magnetic Properties in Doped FeVAl within a Bipolar Random Anderson Model
Takami Tohyama, Hidetoshi Fukuyama
We investigate the thermoelectric and magnetic properties of Si-substituted -type and Ti-substituted -type Heusler alloy FeVAl using the bipolar random Anderson model, wh…
Quantum-geometric origin of superfluid weight in quasicrystals with critical states
Kazuma Saito, Ryo Okugawa, Yusuke Kato +1
A distinctive feature of many quasiperiodic systems is the presence of critical states that are neither extended nor exponentially localized. We investigate the geometric effect on…
BCS-BEC crossover driven by small Fermi pockets of a high-Tc cuprate superconductor
Junhyeok Jeong, Yamato Enomoto, Yoshimitsu Kohama +16
Fermi arcs observed in underdoped cuprates have sparked debate over whether they represent segments of a large Fermi surface or small Fermi pockets. This ambiguity has long hindere…
The antiferromagnetic Chern insulator phase in the Kane-Mele-Hubbard model
Bao-Qing Wang, Can Shao, Takami Tohyama +2
The emergence of the antiferromagnetic (AFM) Chern insulator (AFCI) phase in the Kane-Mele-Hubbard (KMH) model with a finite sublattice potential is investigated. The AFCI, charact…