Integrable models for asymmetric Fermi superfluids: Emergence of a new exotic pairing phase

Details Integrable models for asymmetric Fermi superfluids: Emergence of a new exotic pairing phase Integrable models for asymmetric Fermi superfluids: Emergence of a new exotic pairing phase

2005-10-24

arxiv.org/abs/cond-mat/0510635v2

Phys.Rev.Lett.96:180404,2006

Physics

Condensed Matter

Other Condensed Matter

Revised version accepted for publication

Scientific paper

10.1103/PhysRevLett.96.180404

We introduce an exactly-solvable model to study the competition between the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) and breached-pair superfluid in strongly interacting ultracold asymmetric Fermi gases. One can thus investigate homogeneous and inhomogeneous states on an equal footing and establish the quantum phase diagram. For certain values of the filling and the interaction strength, the model exhibits a new stable exotic pairing phase which combines an inhomogeneous state with an interior gap to pair-excitations. It is proven that this phase is the exact ground state in the strong coupling limit, while numerical examples demonstrate that also at finite interaction strength it can have lower energy than the breached-pair or LOFF states.

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