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Activity-induced ferromagnetism in one-dimensional quantum many-body systems
Kazuaki Takasan, Kyosuke Adachi, Kyogo Kawaguchi
We study a non-Hermitian quantum many-body model in one dimension analogous to the Vicsek model or active spin models, and investigate its quantum phase transitions. The model cons…
Ferromagnetism in tilted fermionic Mott insulators
Kazuaki Takasan, Masaki Tezuka
We investigate the magnetism in tilted fermionic Mott insulators. With a small tilt, the fermions are still localized and form a Mott-insulating state, where the localized spins in…
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…