Rashba-type spin-orbit coupling in bilayer Bose-Einstein condensates

S. W. Su, S. C. Gou, Q. Sun, L. Wen, W. M. Liu, A. C. Ji, J. Ruseckas, G. Juzeliunas

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Abstract

We explore a way of producing the Rashba spin-orbit coupling (SOC) for ultracold atoms by using a two-component (spinor) atomic Bose-Einstein condensate (BEC) confined in a bilayer geometry. The SOC of the Rashba type is created if the atoms pick up a π phase after completing a cyclic transition between four combined spin-layer states composed of two spin and two layer states. The cyclic coupling of the spin-layer states is carried out by combining an intralayer Raman coupling and an interlayer laser assisted tunneling. We theoretically determine the ground-state phases of the spin-orbit-coupled BEC for various strengths of the atom-atom interaction and the laser-assisted coupling. It is shown that the bilayer scheme provides a diverse ground-state phase diagram. In an intermediate range of the atom-light coupling two interlacing lattices of half-skyrmions and half-antiskyrmions are spontaneously created. In the strong-coupling regime, where the SOC of the Rashba type is formed, the ground state represents plane-wave or standing-wave phases depending on the interaction between the atoms. A variational analysis is shown to be in good agreement with the numerical results.

Original languageEnglish
Article number053630
JournalPhysical Review A
Volume93
Issue number5
DOIs
Publication statusPublished - 2016 May 31

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Su, S. W., Gou, S. C., Sun, Q., Wen, L., Liu, W. M., Ji, A. C., ... Juzeliunas, G. (2016). Rashba-type spin-orbit coupling in bilayer Bose-Einstein condensates. Physical Review A, 93(5), [053630]. https://doi.org/10.1103/PhysRevA.93.053630