Phase diagram of a cold polarized Fermi gas

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D. T. Son¹ and M. A. Stephanov²
¹Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550, USA
²Department of Physics, University of Illinois, Chicago, Illinois 60607-7059, USA

Received 5 August 2005; published 17 July 2006

Wepropose a phase diagram for a cold polarized atomic Fermigas with zero-range interaction. We identify four main phases inthe plane of density and polarization: the superfluid phase, thenormal phase, the gapless superfluid phase, and the modulated phase.We argue that there exists a Lifshitz point at thejunction of the normal, the gapless superfluid, and the modulatedphases, and a splitting point where the superfluid, the gaplesssuperfluid, and the modulated phases meet. We show that thephysics near the splitting point is universal and derive aneffective field theory describing it. We also show that subregionswith one and two Fermi surfaces exist within the normaland the gapless superfluid phases.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.013614
DOI:	10.1103/PhysRevA.74.013614
PACS:	03.75.Ss 03.75.Ss Degenerate Fermi gases YEAR: 2006
KEYWORDS:	fermion systems, superfluidity, phase diagrams

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