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Floquet engineering of topological phases protected by emergent symmetries under resonant drives
Kaoru Mizuta, Kazuaki Takasan, Norio Kawakami
Floquet engineering is one of the most vigorous fields in periodically driven (Floquet) systems, with which we can control phases of matter usually by high-frequency drives. In thi…
Dielectric breakdown of strongly correlated insulators in one dimension: Universal formula from non-Hermitian sine-Gordon theory
Kazuaki Takasan, Masaya Nakagawa, Norio Kawakami
Application of a strong electric field to insulators induces a finite current. This phenomenon is called dielectric breakdown and is known as a fundamental nonequilibrium and nonli…
Nonlocal optical responses of ultrapure metals in the hydrodynamic regime
Riki Toshio, Kazuaki Takasan, Norio Kawakami
Our conventional understanding of optical responses in metals has been based on the Drude theory. In recent years, however, it has become possible to prepare ultrapure metallic sam…
Theory of Non-Hermitian Fermionic Superfluidity with a Complex-Valued Interaction
Kazuki Yamamoto, Masaya Nakagawa, Kyosuke Adachi +3
Motivated by recent experimental advances in ultracold atoms, we analyze a non-Hermitian (NH) BCS Hamiltonian with a complex-valued interaction arising from inelastic scattering be…
High-frequency Expansion for Floquet Prethermal Phases with Emergent Symmetries: Application to Time Crystals and Floquet Engineering
Kaoru Mizuta, Kazuaki Takasan, Norio Kawakami
Prethermalization, where quasi-steady states are realized in the intermediate long time regime (prethermal regime), in periodically driven (Floquet) systems is an important phenome…