arXiv 1507.003182015-07-01cond-mat.quant-gas

自旋轨道耦合玻色-爱因斯坦凝聚体中的动力学自旋密度波

Dynamical spin-density waves in a spin-orbit-coupled Bose-Einstein condensate

Yan Li, Chunlei Qu, Yongsheng Zhang, Chuanwei Zhang

备注：: 8 pages, 8 figures
发表信息：: Phys. Rev. A 92, 013635 (2015)
DOI：: 10.1103/PhysRevA.92.013635

摘要：

合成自旋轨道（SO）耦合是凝聚态物理量子模拟的重要组成部分，近年来引起了人们的广泛关注。SO耦合玻色-爱因斯坦凝聚体（BEC）的静态和动态性质在理论和实验上都得到了广泛的研究。在这里，我们数值研究的产生和传播的\textit{dynamical}自旋密度波（SDW）在SO耦合BEC使用快速移动的高斯形障碍。我们发现，SDW波长对势垒的速度敏感，而对势垒的峰值电势或宽度变化不大。我们定性地解释了SDW的产生，考虑在一个一维系统中的矩形障碍。我们的研究结果可能会激励未来的实验和理论研究丰富的动力学在SO耦合BEC引起的移动障碍。

英文摘要：

Synthetic spin-orbit (SO) coupling, an important ingredient for quantum simulation of many exotic condensed matter physics, has recently attracted considerable attention. The static and dynamic properties of a SO coupled Bose-Einstein condensate (BEC) have been extensively studied in both theory and experiment. Here we numerically investigate the generation and propagation of a \textit{dynamical} spin-density wave (SDW) in a SO coupled BEC using a fast moving Gaussian-shaped barrier. We find that the SDW wavelength is sensitive to the barrier's velocity while varies slightly with the barrier's peak potential or width. We qualitatively explain the generation of SDW by considering a rectangular barrier in a one dimensional system. Our results may motivate future experimental and theoretical investigations of rich dynamics in the SO coupled BEC induced by a moving barrier.

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