Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in two-dimensional and three-dimensional optical lattices

Zi Cai, Yupeng Wang, and Congjun Wu
Phys. Rev. A 83, 063621 – Published 16 June 2011

Abstract

We present the study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states in the p-orbital bands in both two- and three-dimensional optical lattices. Due to the quasi-one-dimensional band structure which arises from the unidirectional hopping of the orthogonal p orbitals, the pairing phase space is not affected by spin imbalance. Furthermore, interactions build up high-dimensional phase coherence which stabilizes the FFLO states in 2D and 3D optical lattices in a large parameter regime in the phase diagram. These FFLO phases are stable with the imposition of the inhomogeneous trapping potential. Their entropies are comparable to the normal states at finite temperatures.

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  • Received 17 September 2010

DOI:https://doi.org/10.1103/PhysRevA.83.063621

©2011 American Physical Society

Authors & Affiliations

Zi Cai1, Yupeng Wang2, and Congjun Wu1

  • 1Department of Physics, University of California, San Diego, California 92093, USA
  • 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100080 Beijing, People’s Republic of China

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Vol. 83, Iss. 6 — June 2011

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