Tricriticalities and Quantum Phases in Spin-Orbit-Coupled Spin- Bose Gases
arXiv:1511.09225 · doi:10.1103/PhysRevLett.117.125301
Abstract
We study the zero-temperature phase diagram of a spin-orbit-coupled Bose-Einstein condensate of spin , with equally weighted Rashba and Dresselhaus couplings. Depending on the antiferromagnetic or ferromagnetic nature of the interactions, we find three kinds of striped phases with qualitatively different behaviors in the modulations of the density profiles. Phase transitions to the zero-momentum and the plane-wave phases can be induced in experiments by independently varying the Raman coupling strength and the quadratic Zeeman field. The properties of these transitions are investigated in detail, and the emergence of tricritical points, which are the direct consequence of the spin-dependent interactions, is explicitly discussed.
6 pages, 2 figures + Supplemental Material. Revised version, published in PRL
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