Normal State of Highly Polarized Fermi Gases: Full Many-Body Treatment

R. Combescot and S. Giraud
Phys. Rev. Lett. 101, 050404 – Published 1 August 2008

Abstract

We consider a single atom within a Fermi sea of atoms. We elucidate by a full many-body analysis the quite mysterious agreement between Monte Carlo results and approximate calculations taking only into account single particle-hole excitations. It results from a nearly perfect destructive interference of the contributions of states with more than one particle-hole pair. This is linked to the remarkable efficiency of the expansion in powers of hole wave vectors, the lowest order leading to perfect interference. Going up to two particle-hole pairs gives an essentially perfect agreement with known exact results. Hence our treatment amounts to an exact solution of this problem.

  • Figure
  • Received 18 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.050404

©2008 American Physical Society

Authors & Affiliations

R. Combescot and S. Giraud

  • Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France

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Vol. 101, Iss. 5 — 1 August 2008

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