Bound State of Ultracold Fermions in the Spin Imbalanced Normal State

Details Bound State of Ultracold Fermions in the Spin Imbalanced Normal State Bound State of Ultracold Fermions in the Spin Imbalanced Normal State

2007-02-28

arxiv.org/abs/cond-mat/0703003v2

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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.

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