• Open Access

Cooper pair polaritons in cold fermionic atoms within a cavity

Amaury Dodel, Alexander Pikovski, Igor Ermakov, Marek Narozniak, Valentin Ivannikov, Haibin Wu, and Tim Byrnes
Phys. Rev. Research 2, 013184 – Published 21 February 2020

Abstract

We formulate a Bardeen-Cooper-Schriffer (BCS) theory of quasiparticles in a degenerate Fermi gas strongly coupled to photons in a optical cavity. The elementary photonic excitations of the system are cavity polaritons, which consist of a cavity photon and an excitation of an atom within the Fermi sea. The excitation of the atom out of the Fermi sea leaves behind a hole, which together results in a loosely bound Cooper pair, allowing for the system to be written by a BCS wave function. As the density of the excitations is increased, the excited atom and hole become more strongly bound, crossing over into the molecular regime. This thus realizes an alternative BCS to BEC crossover scenario, where the participating species are quasiparticle excitations in a Fermi sea consisting of excited atoms and holes.

  • Figure
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  • Received 13 August 2019
  • Accepted 9 December 2019

DOI:https://doi.org/10.1103/PhysRevResearch.2.013184

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Amaury Dodel1,2, Alexander Pikovski2, Igor Ermakov3,2,4, Marek Narozniak2,5, Valentin Ivannikov2, Haibin Wu1,6, and Tim Byrnes2,1,5,6,7,*

  • 1State Key Laboratory of Precision Spectroscopy, School of Physical and Material Sciences, East China Normal University, Shanghai 200062, China
  • 2New York University Shanghai, Pudong, Shanghai 200122, China
  • 3Department of Mathematical Methods for Quantum Technologies, Steklov Mathematical Institute of Russian Academy of Sciences, Gubkina str. 8, Moscow 119991, Russia
  • 4Skolkovo Institute of Science and Technology, Ulitsa Nobelya, 3, Moskva, Moscow Oblast 143026, Russia
  • 5Department of Physics, New York University, New York, New York 10003, USA
  • 6NYU-ECNU Institute of Physics at NYU Shanghai, Shanghai 200062, China
  • 7National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan

  • *tim.byrnes@nyu.edu

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Vol. 2, Iss. 1 — February - April 2020

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