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

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 (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.

5 pages, 2 figures

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Cited by in corpus (59)

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• Exotic superfluidity in spin-orbit coupled Bose-Einstein condensates
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• Quantum criticality of bosonic systems with the Lifshitz dispersion
• Electronic Floquet Liquid Crystals
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