2016/03/31 by Shih-Wei Su, S. -W. Su, Shih-Chuan Gou +13 · 1 citation
Chemistry · Physics and Astronomy · #Atom (system on chip) #Atomic physics #Bilayer #Bose–Einstein condensate #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Coupling (piping) #Ground state #Materials science #Phase (matter) #Phase diagram #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Spin (aerodynamics) #Spin–orbit interaction #Strong Light-Matter Interactions #cond-mat.quant-gas #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physreva.93.053630
published as Physical Review A 93, 053630 (2016) · 13 pages, 9 figures
openalex publication_date 2016/05/31 · arxiv created 2016/06/10 · arxiv updated 2016/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 \ensuremathπ 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.