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Asymmetric Two-component Fermion Systems in Strong Coupling | | J. Carlson
; Sanjay Reddy
; | | Date: |
10 Mar 2005 | | Journal: | Phys.Rev.Lett. 95 (2005) 060401 | | Subject: | Other; Statistical Mechanics | cond-mat.other cond-mat.stat-mech hep-ph nucl-th | | Abstract: | We study the phase structure of a dilute two-component Fermi system with attractive interactions as a function of the coupling and the polarization or number difference between the two components. In weak coupling, a finite number asymmetry results in phase separation. A mixed phase containing symmetric superfluid matter and an asymmetric normal phase is favored. With increasing coupling strength, we show that the stress on the superfluid phase to accommodate a number asymmetry increases. Near the infinite-scattering length limit, we calculate the single-particle excitation spectrum and the ground-state energy at various polarizations. A picture of weakly-interacting quasi-particles emerges for modest polarizations. In this regime near infinite scattering length, and for modest polarizations, a homogeneous phase with a finite population of excited quasi-particle states characterized by a gapless spectrum should be favored over the phase separated state. These states may be realized in cold atom experiments. | | Source: | arXiv, cond-mat/0503256 | | Other source: | [GID 36924] pmid16090928 | | Services: | Forum | Review | PDF | Favorites | |
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