Particle and pair spectra for strongly correlated Fermi gases: A real-frequency solver

T Enss - Physical Review A, 2024 - APS
The strongly attractive Fermi gas in the BCS-BEC crossover is efficiently described in terms
of coupled fermions and fermion pairs, or molecules. We compute the spectral functions of …

Stable nonequilibrium Fulde-Ferrell-Larkin-Ovchinnikov state in a spin-imbalanced driven-dissipative Fermi gas loaded on a three-dimensional cubic optical lattice

T Kawamura, D Kagamihara, Y Ohashi - Physical Review A, 2023 - APS
We theoretically investigate a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) type superfluid
phase transition in a driven-dissipative two-component Fermi gas. The system is assumed to …

Signatures of unconventional pairing in spin-imbalanced one-dimensional few-fermion systems

D Pęcak, T Sowiński - Physical Review Research, 2020 - APS
A system of a few attractively interacting fermionic Li 6 atoms in one-dimensional harmonic
confinement is investigated. Nontrivial interparticle correlations induced by interactions in a …

Non-Hermitian BCS-BEC crossover of Dirac fermions

T Kanazawa - Journal of High Energy Physics, 2021 - Springer
A bstract We investigate chiral symmetry breaking in a model of Dirac fermions with a
complexified coupling constant whose imaginary part represents dissipation. We introduce a …

Feasibility of a Fulde-Ferrell-Larkin-Ovchinnikov superfluid Fermi atomic gas

T Kawamura, Y Ohashi - Physical Review A, 2022 - APS
We theoretically explore a promising route to achieve the Fulde-Ferrell-Larkin-Ovchinnikov
(FFLO) state in a spin-imbalanced ultracold Fermi gas. In the current stage of cold atom …

Proposed Fermi-surface reservoir engineering and application to realizing unconventional Fermi superfluids in a driven-dissipative nonequilibrium Fermi gas

T Kawamura, R Hanai, Y Ohashi - Physical Review A, 2022 - APS
We develop a theory to describe the dynamics of a driven-dissipative many-body Fermi
system to pursue our proposal to realize exotic quantum states based on reservoir …

Emergence of Larkin-Ovchinnikov-type superconducting state in a voltage-driven superconductor

T Kawamura, Y Ohashi, HTC Stoof - Physical Review B, 2024 - APS
We theoretically investigate a voltage-biased normal metal–superconductor–normal metal
(NSN) junction. Using the nonequilibrium Green's function technique, we derive a quantum …

Periodic dynamics of population-imbalanced fermionic condensates in optical lattices

A Mukherjee, R Dasgupta - The European Physical Journal B, 2024 - Springer
We investigate the dynamics of a population-imbalanced two-species fermionic system
trapped in an optical lattice. The paired fermions here can form bosonic molecules via …

Transport of spin and mass at normal-superfluid interfaces in the unitary Fermi gas

D Zhang, AT Sommer - Physical Review Research, 2022 - APS
Transport in strongly interacting Fermi gases provides a window into the nonequilibrium
behavior of strongly correlated fermions. In particular, the interface between a strongly …

Nonequilibrium BCS-BEC crossover and unconventional FFLO superfluid in a strongly interacting driven-dissipative Fermi gas

T Kawamura, Y Ohashi - arXiv preprint arXiv:2408.00446, 2024 - arxiv.org
We present a theoretical review of the recent progress in nonequilibrium BCS (Bardeen-
Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover physics. As a paradigmatic …