Spin 1/2 Fermions in the Unitary Regime: A Superfluid of a New Type

Aurel Bulgac, Joaquín E. Drut, and Piotr Magierski
Phys. Rev. Lett. 96, 090404 – Published 10 March 2006

Abstract

We study, in a fully nonperturbative calculation, a dilute system of spin 1/2 interacting fermions, characterized by an infinite scattering length at finite temperatures. Various thermodynamic properties and the condensate fraction are calculated and we also determine the critical temperature for the superfluid-normal phase transition in this regime. The thermodynamic behavior appears as a rather surprising and unexpected mélange of fermionic and bosonic features. The thermal response of a spin 1/2 fermion at the BCS-BEC crossover should be classified as that of a new type of superfluid.

  • Figure
  • Received 16 May 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.090404

©2006 American Physical Society

Authors & Affiliations

Aurel Bulgac1, Joaquín E. Drut1, and Piotr Magierski1,2

  • 1Department of Physics, University of Washington, Seattle, Washington 98195–1560, USA
  • 2Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw, Poland

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Issue

Vol. 96, Iss. 9 — 10 March 2006

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