RT Journal Article
T1 Triplet pair correlations in s-wave superfluids as a signature of the Fulde-Ferrell-Larkin-Ovchinnikov state
A1 Sols Lucía, Fernando
A1 Zapata, I.
A1 Demler, E.
AB 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
PB American Physical Society
SN 0031-9007
YR 2012
FD 2012-10-09
LK https://hdl.handle.net/20.500.14352/44335
UL https://hdl.handle.net/20.500.14352/44335
LA eng
NO © 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.
NO Comunidad de Madrid
NO Ministerio de Ciencia e Innovación (MICINN)
NO Real Colegio Complutense en Harvard
NO Harvard-MIT CUA
NO Army Research Office
NO NSF
NO AFOSR Quantum Simulation MURI
NO AFOSR MURI on Ultracold Molecules
NO ARO-MURI on Atomtronics
DS Docta Complutense
RD 6 jul 2025