| Title |
Ground states of a Bose-Einstein Condensate in a one-dimensional laser-assisted optical lattice / |
| Authors |
Sun, Qing ; Hu, Jie ; Wen, Lin ; Liu, W.-M ; Juzeliūnas, Gediminas ; Ji, An-Chun |
| DOI |
10.1038/srep37679 |
| Full Text |
|
| Is Part of |
Scientific reports.. London : Nature Publishing Group. 2016, Vol. 6, Art. No. 37679.. ISSN 2045-2322 |
| Keywords [eng] |
neutral atoms ; dynamics ; fields |
| Abstract [eng] |
We study the ground-state behavior of a Bose-Einstein Condensate (BEC) in a Raman-laser-assisted one-dimensional (1D) optical lattice potential forming a multilayer system. We find that, such system can be described by an effective model with spin-orbit coupling (SOC) of pseudospin (N-1)/2, where N is the number of layers. Due to the intricate interplay between atomic interactions, SOC and laser-assisted tunnelings, the ground-state phase diagrams generally consist of three phases-a stripe, a plane wave and a normal phase with zero-momentum, touching at a quantum tricritical point. More important, even though the single-particle states only minimize at zero-momentum for odd N, the many-body ground states may still develop finite momenta. The underlying mechanisms are elucidated. Our results provide an alternative way to realize an effective spin-orbit coupling of Bose gas with the Raman-laser-assisted optical lattice, and would also be beneficial to the studies on SOC effects in spinor Bose systems with large spin. |
| Published |
London : Nature Publishing Group |
| Type |
Journal article |
| Language |
English |
| Publication date |
2016 |
