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PreprintCC BY 4.0arXiv

Non-Thermal Effects in Fermionic Atoms Coupled to Open Cavities

  • Jules Sueiro
  • Marco Schiro
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Abstract

We study a Fermi-Hubbard model coupled to a open dissipative single cavity mode. Using Keldysh diagrammatics we derive and solve the quantum kinetic equations for the fermions, taking the bosonic cavity mode as a source of non-equilibrium noise and dissipation. In absence of Hubbard interactions we show that the fermions reach generically a non-equilibrium steady-state, characterized by a non-thermal distribution function. Quite interestingly we demonstrate that the latter exactly nullifies the heat-current between fermions and cavity mode. We discuss the regimes of parameters where a low-frequency effective temperature description emerges and how the fluctuations affect the mean-field phase diagram for the superradiance phase transition. Finally we include Hubbard interaction in the weak-coupling regime and show that it leads to a crossover towards a full equilibrium distribution.

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Cite

BibTeXRIS
BibTeX
@misc{sueiro2026nonthermal,
  title = {{Non-Thermal Effects in Fermionic Atoms Coupled to Open Cavities}},
  author = {Jules Sueiro and Marco Schiro},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.20434},
  eprint = {2609.20434},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.20434},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Non-Thermal Effects in Fermionic Atoms Coupled to Open Cavities
AU  - Jules Sueiro
AU  - Marco Schiro
PY  - 2026
DA  - 2026/10/08
PB  - arXiv
DO  - 10.48550/arxiv.2609.20434
UR  - https://arxiv.org/abs/2609.20434
AB  - We study a Fermi-Hubbard model coupled to a open dissipative single cavity mode. Using Keldysh diagrammatics we derive and solve the quantum kinetic equations for the fermions, taking the bosonic cavity mode as a source of non-equilibrium noise and dissipation. In absence of Hubbard interactions we show that the fermions reach generically a non-equilibrium steady-state, characterized by a non-thermal distribution function. Quite interestingly we demonstrate that the latter exactly nullifies the heat-current between fermions and cavity mode. We discuss the regimes of parameters where a low-frequency effective temperature description emerges and how the fluctuations affect the mean-field phase diagram for the superradiance phase transition. Finally we include Hubbard interaction in the weak-coupling regime and show that it leads to a crossover towards a full equilibrium distribution.
ER  -