4 papers
One-dimensional extended Hubbard model coupled with an optical cavity
Taiga Nakamoto, Kazuaki Takasan, Naoto Tsuji
We study the one-dimensional extended Hubbard model coupled with an optical cavity, which describes an interplay of the effect of vacuum fluctuation of light and the quantum phase…
Current-Enabled Optical Conductivity of Collective Modes in Unconventional Superconductors
Gerrit Niederhoff, Ryusei Kataoka, Kazuaki Takasan +1
We theoretically investigate the current-enabled linear optical conductivity of collective modes in superconductors with unconventional pairing symmetries. After deriving general f…
Superconducting nonlinear Hall effect induced by geometric phases
Kazuaki Takasan, Naoto Tsuji
We study the nonlinear Hall effect in superconductors without magnetic fields induced by a quantum geometric phase (i.e., the Aharonov-Bohm phase) carried by single or pair particl…
Nonequilibrium hysteretic phase transitions in periodically light-driven superconductors
Huanyu Zhang, Kazuaki Takasan, Naoto Tsuji
We find nonequilibrium phase transitions accompanied by multiple (nested) hysteresis behaviors in superconductors coupled to baths under a time-periodic light driving. The transiti…