Occupation numbers in strongly polarized Fermi gases and the Luttinger theorem

Michael Urban and Peter Schuck
Phys. Rev. A 90, 023632 – Published 27 August 2014

Abstract

We study a two-component Fermi gas that is so strongly polarized that it remains normal fluid at zero temperature. We calculate the occupation numbers within the particle-particle random-phase approximation, which is similar to the Nozières-Schmitt-Rink approach. We show that the Luttinger theorem is fulfilled in this approach. We also study the change of the chemical potentials which allows us to extract, in the limit of extreme polarization, the polaron energy.

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  • Received 8 July 2014

DOI:https://doi.org/10.1103/PhysRevA.90.023632

©2014 American Physical Society

Authors & Affiliations

Michael Urban1 and Peter Schuck1,2

  • 1Institut de Physique Nucléaire, CNRS-IN2P3 and Université Paris-Sud, 91406 Orsay Cedex, France
  • 2Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS and Université Joseph Fourier, Maison des Magistères, BP 166, 38042 Grenoble Cedex, France

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Vol. 90, Iss. 2 — August 2014

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