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 language | English (US) |
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Article number | 061604 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 84 |
Issue number | 6 |
DOIs | |
State | Published - Dec 16 2011 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics