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arXiv 2007.11108cond-mat.quant-gas
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环形光晶格中的阻塞布居

Blocked populations in ring-shaped optical lattices

M. Nigro, P. Capuzzi, D. M. Jezek

摘要:

我们研究了环形晶格中玻色-爱因斯坦凝聚体的一种特殊的动力学机制,在这种机制中,在时间演化过程中,每个位置的粒子数保持不变。在这个制度中的状态的特征在于在交替的井和非平凡的相位相等的占用数,而相邻的网站之间的相位差随时间演变产生持续的电流,振荡周围的晶格。我们发现,周围的环形晶格的速度循环交替的两个值之间的井的数量和一个特定的时间周期,仅由现场的相互作用能量参数。与存在于光晶格中的自陷机制相反,在每个位置处的占据数不显示任何振荡,并且颗粒不平衡不具有发生该现象的下限。这些研究结果预测与多模模型,并证实了全三维Gross-Pitaevskii模拟使用有效的现场相互作用能量参数。

英文摘要:

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.

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