Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases

Zhen Zheng and Z. D. Wang
Phys. Rev. A 101, 023612 – Published 19 February 2020

Abstract

Motivated by recent experimental advances in ultracold atomic gases placed in cavities, we study the influence of the atom-cavity coupling on the Fermi gases trapped in optical lattices. By adiabatic elimination of the cavity photon field, the atom-cavity coupling gives rise to effective long-range interactions. It results in a variety of two-body scattering processes, during which the atomic pairs can acquire an additional center-of-mass momentum. This reveals the possibility of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids in which the atomic pairing momentum is nonzero. By inspecting the phase diagram at the mean-field level, we confirm that the FFLO superfluid phase coexists with the zero-momentum pairing, and is the ground state that hosts the lowest energy. Furthermore, the order parameter characterizing the non-zero-momentum pairing does not vanish as long as the cavity-induced interaction is present.

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  • Received 22 October 2019
  • Accepted 3 February 2020

DOI:https://doi.org/10.1103/PhysRevA.101.023612

©2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Zhen Zheng*

  • Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, The University of Hong Kong, Pokfulam Road, Hong Kong, China

Z. D. Wang

  • Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, The University of Hong Kong, Pokfulam Road, Hong Kong, China and Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China

  • *zhenzhen.dr@hku.hk
  • zwang@hku.hk

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Issue

Vol. 101, Iss. 2 — February 2020

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