Triplet pair correlations in s-wave superfluids as a signature of the Fulde-Ferrell-Larkin-Ovchinnikov state



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Sols Lucía, Fernando and Zapata, I. and Demler, E. (2012) Triplet pair correlations in s-wave superfluids as a signature of the Fulde-Ferrell-Larkin-Ovchinnikov state. Physical Review Letters, 109 (15). ISSN 0031-9007

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We show that antiparallel triplet pairing correlations are generated in superfluids with purely s-wave interactions whenever population imbalance enforces anisotropic Fulde Ferrell (FF) or inhomogeneous Larkin-Ovchinikov (LO) states. These triplet correlations appear in the Cooper pair wave function, while the triplet part of the gap remains zero. The same set of quasiparticle states contributes to the triplet component and to the polarization, thus spatially correlating them. In the LO case, this set forms a narrow band of Andreev states centered on the nodes of the s-wave order parameter. This picture naturally provides a unifying explanation of previous findings that attractive p-wave interaction stabilizes FFLO states. We also study a similar triplet mixing which occurs when a balanced two-component system displays FFLO-type oscillations due to a spin dependent optical lattice. We discuss how this triplet component can be measured in systems of ultracold atoms using a rapid ramp across a p-wave Feshbach resonance. This should provide a smoking gun signature of FFLO states

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© 2012 American Physical Society.
We thank R. Hulet and A. Dalgarno for helpful discussions. This work has been supported by MICINN (Spain) through Grants No. FIS2007-65723 and No. FIS2010-21372 Comunidad de Madrid through MICROSERES grant, Army Research Office with funding from the DARPA OLE program, Harvard-MIT CUA, NSF Grant No. DMR-07-05472, AFOSR Quantum Simulation MURI, AFOSR MURI on Ultracold Molecules, and the ARO-MURI on Atomtronics. One of us (I. Z.) acknowledges support from Real Colegio Complutense at Harvard.

Uncontrolled Keywords:Feshbach Resonance, Fermi gas, Superconductors, Field
Subjects:Sciences > Physics > Materials
ID Code:26482
Deposited On:05 Aug 2014 09:44
Last Modified:13 Feb 2018 19:16

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