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28 March 2024
 
  » arxiv » cond-mat/0606322

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Finite Temperature Phase Diagram of a Two-Component Fermi Gas with Density Imbalance
Lianyi He ; Meng Jin ; Pengfei Zhuang ;
Date 13 Jun 2006
Subject Superconductivity; Other; Statistical Mechanics
AbstractWe investigated possible superfluid phases at finite temperature in a two-component Fermi gas with density imbalance. In the frame of a general four-fermion interaction theory, we solved the gap equations for the pairing gap and pairing momentum under the restriction of fixed number densities, and analyzed the stability of different phases by calculating the superfluid density and number susceptibilities. The homogeneous superfluid is stable only at high temperature and low number asymmetry, the inhomogeneous LOFF survives at low temperature and high number asymmetry, and in between them there exists another possible inhomogeneous phase, the phase separation. The critical temperatures and the orders of the phase transitions among the superfluid phases and normal phase are calculated analytically and numerically. The phase diagram we obtained in the temperature and number asymmetry plane is quite different from the one in temperature and chemical potential difference plane for a system with fixed chemical potentials.
Source arXiv, cond-mat/0606322
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