arXiv 1609.059552016-09cond-mat.quant-gas

一维laser辅助光晶格中玻色-爱因斯坦凝聚体的基态

Ground states of a Bose-Einstein Condensate in a one-dimensional laser-assisted optical lattice

Qing Sun, Jie Hu, Lin Wen, W. -M. Liu, G. Juzeliunas, An-Chun Ji

备注：: version published in Scientific Reports
发表信息：: Scientific Reports 6, 37679 (2016)
DOI：: 10.1038/srep37679

摘要：

本文研究了玻色-爱因斯坦凝聚体（BEC）在喇曼激光辅助的一维光晶格势多层体系中的基态行为。我们发现，这种系统可以用赝自旋$(N-1)/2$的自旋轨道耦合（SOC）模型来描述，其中$N$是层数。由于原子相互作用、SOC和激光辅助隧穿之间的复杂相互作用，基态相图通常由三个相组成--条纹、平面波和零动量的正常相，在量子三临界点接触。更重要的是，即使单粒子态只在零动量处最小化，多体基态仍可能发展有限动量。阐明了潜在的机制。我们的研究结果为实现玻色气体与拉曼激光辅助光晶格的有效自旋轨道耦合提供了一种新的途径，也将有助于大自旋玻色自旋系统中SOC效应的研究.

英文摘要：

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.

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