论文标题
环形光学晶格中的人口阻塞
Blocked populations in ring-shaped optical lattices
论文作者
论文摘要
我们研究了在一个环形晶格中的玻色网凝结物的特殊动力学状态，在该晶格中，每个地点的种群在时间演化期间保持恒定。该制度中的状态的特征是替代井和非平凡阶段中的相等职业数量，而相邻位点之间的相位差异在及时演变，产生了持续的电流，这些电流在晶格周围振荡。我们表明，环晶格周围的速度循环在两个由井数和特定时间段确定的两个值之间交替，而特定时间段仅由现场相互作用能量参数驱动。与光学晶格中存在的自捕捉机制相反，每个位点的职业数没有显示出任何振荡，并且粒子不平衡不具有下限，而对于发生这种现象。这些发现是用多模型预测的，并通过使用有效的现场相互作用能量参数通过完整的三维GROSS-PITAEVSKII模拟确认。
We study a special dynamical regime of a Bose-Einstein condensate in a ring-shaped lattice where the populations in each site remain constant during the time evolution. The states in this regime are characterized by equal occupation numbers in alternate wells and non-trivial phases, while the phase differences between neighboring sites evolve in time yielding persistent currents that oscillate around the lattice. We show that the velocity circulation around the ring lattice alternates between two values determined by the number of wells and with a specific time period that is only driven by the onsite interaction energy parameter. In contrast to the self-trapping regime present in optical lattices, the occupation number at each site does not show any oscillation and the particle imbalance does not possess a lower bound for the phenomenon to occur. These findings are predicted with a multimode model and confirmed by full three-dimensional Gross-Pitaevskii simulations using an effective onsite interaction energy parameter.
