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PreprintCC BY 4.0arXiv

Entropy transport through a superfluid quantum point contact: A Keldysh field-theory approach

  • Davide Bertolusso
  • C. J. Bolech
  • Thierry Giamarchi
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Abstract

We study the matter and entropy transport between two ultra-cold neutral Fermi-gas reservoirs linked by a quantum point contact under a chemical-potential gradient. We describe the two leads with a BCS mean-field model and derive the current-bias characteristics for both particle and entropy transport. We compute the out of equilibrium steady-state currents by using the Keldysh formalism. In accordance with previous works in the literature, we confirm the well-known behavior for the particle current and extend the computation to the entropy current in the BCS regime. The entropy current shows an oscillatory behavior at low voltage in the ballistic junction limit. We analyze the results for a wide range of values of the junction's transparency. We also compare our findings with experimental results in cold atomic gases in the unitary regime.

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Cite

BibTeXRIS
BibTeX
@misc{bertolusso2026entropy,
  title = {{Entropy transport through a superfluid quantum point contact: A Keldysh field-theory approach}},
  author = {Davide Bertolusso and C. J. Bolech and Thierry Giamarchi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.00679},
  eprint = {2605.00679},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.00679},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Entropy transport through a superfluid quantum point contact: A Keldysh field-theory approach
AU  - Davide Bertolusso
AU  - C. J. Bolech
AU  - Thierry Giamarchi
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2605.00679
UR  - https://arxiv.org/abs/2605.00679
AB  - We study the matter and entropy transport between two ultra-cold neutral Fermi-gas reservoirs linked by a quantum point contact under a chemical-potential gradient. We describe the two leads with a BCS mean-field model and derive the current-bias characteristics for both particle and entropy transport. We compute the out of equilibrium steady-state currents by using the Keldysh formalism. In accordance with previous works in the literature, we confirm the well-known behavior for the particle current and extend the computation to the entropy current in the BCS regime. The entropy current shows an oscillatory behavior at low voltage in the ballistic junction limit. We analyze the results for a wide range of values of the junction's transparency. We also compare our findings with experimental results in cold atomic gases in the unitary regime.
ER  -