Visibility and stability of superstripes in a spin-orbit-coupled Bose-Einstein condensate

Year: 2015

Authors: Martone GI.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.

Abstract: We consider a spin-1/2 Bose-Einstein condensate with equal Rashba and Dresselhaus spin-orbit coupling. After reviewing some relevant features of the quantum phases of the system, we present a short study on how their properties are changed by the presence of non-zero magnetic detunings and spin-asymmetric interactions. At small values of the Raman coupling and of the magnetic field the so-called stripe phase occurs, which displays both superfluidity and periodic density modulations, in analogy with supersolids. We finally review a recent proposal (Phys. Rev. A 90, 041604) to improve the visibility of the fringes, based on the space separation of the two spin components into a 2D bi-layer configuration and on the application of a pi/2 Bragg pulse, and we show that this new configuration also yields a sizable increase of the stability of the stripe phase against magnetic fluctuations.

Journal/Review: EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS

Volume: 224 (3)      Pages from: 553  to: 563

More Information: The author acknowledges stimulating discussions with Yun Li and Sandro Stringari. This work has been supported by ERC through the QGBE grant and by Provincia Autonoma di Trento.
KeyWords: Neutral Atoms; Crystals; Gas
DOI: 10.1140/epjst/e2015-02386-x

Citations: 14
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