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Phys. Rev. Lett. 97, 120407 (2006) [4 pages]

Generic Phase Diagram of Fermion Superfluids with Population Imbalance

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K. Machida, T. Mizushima, and M. Ichioka
Department of Physics, Okayama University, Okayama 700-8530, Japan

Received 8 April 2006; published 21 September 2006

Itis shown by microscopic calculations for trapped imbalanced Fermi superfluidsthat the gap function always has sign changes, i.e., theFulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like state, up to a critical imbalance P_c, beyondwhich normal state becomes stable, at temperature T=0. A temperature-versus-pressurephase diagram is constructed, where the BCS state without signchange is stable only at T [not-equal] 0. We reproduce the observedbimodality in the density profile to identify its origin andevaluate P_c as functions of T and the coupling strength.These dependencies match with the recent experiments.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.120407
DOI:	10.1103/PhysRevLett.97.120407
PACS:	05.30.Fk; 03.75.Hh; 03.75.Ss; 74.20.Fg 05.30.Fk Fermion systems and electron gas (quantum statistical mechanics) 03.75.Hh Static properties of Bose-Einstein condensates; thermodynamical, statistical, and structural properties 03.75.Ss Degenerate Fermi gases 74.20.Fg BCS theory of superconductivity and its development YEAR: 2006

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