Scientific Results

Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid

Year: 2014

Authors: Martone G.I., Li Y., Stringari S.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy; Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, 117542 Singapore

Abstract: The striped phase exhibited by a spin-1/2 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 pi/2 Bragg pulse, causing the increase of the fringe wavelength, and of a pi/2 rf pulse, revealing the coherent nature of the order parameter in the spin channel.

Journal/Review: PHYSICAL REVIEW A

Volume: 90 (4)      Pages from: 041604-1  to: 041604-5

More Information: We would like to thank Jean Dalibard, Gabriele Ferrari, Giacomo Lamporesi, Lev P. Pitaevskii, and Ian Spielman for stimulating discussions. This work was supported by the ERC through the QGBE grant and by Provincia Autonoma di Trento.
DOI: 10.1103/PhysRevA.90.041604

Citations: 29
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English