Visibility and stability of superstripes in a spin-orbit-coupled Bose-Einstein condensate
INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
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Received: 15 October 2014
Revised: 19 February 2015
Published online: 9 April 2015
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 π/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.
© EDP Sciences, Springer-Verlag, 2015