arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1001.0865cond-mat.quant-gas
收藏

旋转二维玻色-爱因斯坦凝聚体中涡旋成核的观测

Observation of vortex nucleation in a rotating two-dimensional lattice of Bose-Einstein condensates

R. A. Williams, S. Al-Assam, C. J. Foot

摘要:

本文报道了在旋转光晶格中观察到的涡旋形核现象。将~(87)Rb玻色-爱因斯坦凝聚体加载到静态二维晶格中,然后使晶格的旋转频率从零开始增加。我们研究了涡旋形核与光晶格深度和旋转频率的关系。对于深晶格以上的冷凝物的化学势,我们观察到的旋转频率,甚至低于涡旋成核所需的热力学临界频率的涡旋的数量的线性依赖。在这些晶格深度的系统形成了约瑟夫森耦合冷凝阵列。旋转产生的有效磁场在相邻的凝聚物之间引入了特征相对相位,使得在斜降晶格深度并重组凝聚物时观察到涡旋。

英文摘要:

We report the observation of vortex nucleation in a rotating optical lattice. A 87Rb Bose-Einstein condensate was loaded into a static two-dimensional lattice and the rotation frequency of the lattice was then increased from zero. We studied how vortex nucleation depended on optical lattice depth and rotation frequency. For deep lattices above the chemical potential of the condensate we observed a linear dependence of the number of vortices created with the rotation frequency,even below the thermodynamic critical frequency required for vortex nucleation. At these lattice depths the system formed an array of Josephson-coupled condensates. The effective magnetic field produced by rotation introduced characteristic relative phases between neighbouring condensates, such that vortices were observed upon ramping down the lattice depth and recombining the condensates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑