Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid
arXiv:1409.3149 · doi:10.1103/PhysRevA.90.041604
Abstract
The striped phase exhibited by a spin- Bose-Einstein condensate with spin-orbit coupling is characterized by the spontaneous breaking of two continuous symmetries: gauge and translational symmetry. This is a peculiar feature of supersolids and is the consequence of interaction effects. We propose an approach to produce striped configurations with high-contrast fringes, making their experimental detection in atomic gases a realistic perspective. Our approach, whose efficiency is directly confirmed by three-dimensional Gross-Pitaevskii simulations, is based on the space separation of the two spin components into a two-dimensional bilayer configuration, causing the reduction of the effective interspecies interaction and the increase of the stability of the striped phase. We also explore the effect of a Bragg pulse, causing the increase of the fringe wavelength, and of a rf pulse, revealing the coherent nature of the order parameter in the spin channel.
arXiv comment5 pages, 3 figures
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