Bound State of Ultracold Fermions in the Spin Imbalanced Normal State

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We study a polarized Fermi gas and demonstrate that Fano-Feshbach (FF) resonances lead to the pairing of fermions and holes into long living massive bosonic modes (bifermions and biholes), which can be viewed as signatures of a first order quantum phase transition. These modes, which are neither conventional Cooper pairs nor closed channel bosonic dimers, have a peculiar dispersion relation and appear already in the weak coupling limit, i.e. for large FF detunings. Our result is in accord with claims of Schunck \emph{et al.} [cond-mat/0702066] that by stabilizing the normal state the population imbalance still allows effect of s-wave fermionic pairing.
5 pages, 4 figures

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Superconductivity, Statistical Mechanics, Atomic Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/124865

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0703003
 http://arxiv.org/abs/cond-mat/0703003

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arXiv