Hamner C, Zhang Yongping, Khamehchi M A, Davis Matthew J, Engels P
Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.
The University of Queensland, School of Mathematics and Physics, St Lucia, Queensland 4072, Australia.
Phys Rev Lett. 2015 Feb 20;114(7):070401. doi: 10.1103/PhysRevLett.114.070401. Epub 2015 Feb 17.
We investigate a spin-orbit-coupled Bose-Einstein condensate loaded into a translating optical lattice. We experimentally demonstrate the lack of Galilean invariance in the spin-orbit-coupled system, which leads to anisotropic behavior of the condensate depending on the direction of translation of the lattice. The anisotropy is theoretically understood by an effective dispersion relation. We experimentally confirm this theoretical picture by probing the dynamical instability of the system.
我们研究了加载到平移光学晶格中的自旋轨道耦合玻色 - 爱因斯坦凝聚体。我们通过实验证明了自旋轨道耦合系统中伽利略不变性的缺失，这导致凝聚体的各向异性行为取决于晶格平移的方向。通过有效的色散关系从理论上理解了这种各向异性。我们通过探测系统的动力学不稳定性，从实验上证实了这一理论图景。
