Phase transitions and elementary excitations in spin-1 Bose gases with Raman-induced spin-orbit coupling
arXiv:1512.04091 · doi:10.1103/PhysRevA.93.033648
Abstract
We study the ground state phase diagram and the quantum phase transitions in spin-1 Bose gases with Raman induced spin-orbit coupling. In addition to the Bose-Einstein condensates with uniform density, three types of stripe condensation phases that simultaneously break the U(1) symmetry and the translation symmetry are identified. The transitions between these phases are investigated, and the occurrences of the various tricritical points are predicted. The excitation spectra in the plane-wave phase and the zero-momentum phase show rich roton-maxon structures, and their instabilities indicate the tendency to develop the crystalline order. We propose the atomic gas of Na could be a candidate for observing the stripe condensate with high contrast fringes.
10 pages, 8 figures, published version
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