2011/06/30 by Sarang Gopalakrishnan, Austen Lamacraft, Paul M. Goldbart
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.84.061604
published as Phys. Rev. A 84, 061604(R) (2011) · 5 pages, 2 figures
openalex publication_date 2011/12/16 · arxiv created 2011/12/21 · arxiv updated 2011/12/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.