Universal phase structure of dilute Bose gases with Rashba spin-orbit coupling

Sarang Gopalakrishnan, Austen Lamacraft, Paul M. Goldbart

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60 Citations (SciVal)

Abstract

A Bose gas subject to a light-induced Rashba spin-orbit coupling possesses a dispersion minimum on a circle in momentum space; we show that kinematic constraints due to this dispersion cause interactions to renormalize to universal, angle-dependent values that govern the phase structure in the dilute-gas limit. We find that, regardless of microscopic interactions, (a) the ground state involves condensation at two opposite momenta and is, in finite systems, a fragmented condensate and and (b) there is a nonzero-temperature instability toward the condensation of pairs of bosons. We discuss how our results can be reconciled with the qualitatively different mean-field phase diagram, which is appropriate for dense gases.

Original languageEnglish (US)
Article number061604
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume84
Issue number6
DOIs
StatePublished - Dec 16 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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