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arXiv 1409.1835cond-mat.quant-gas
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环上相互作用玻色子持续流的最佳标度

Optimal scaling of persistent currents for interacting bosons on a ring

Marco Cominotti, Matteo Rizzi, Davide Rossini, Davit Aghamalyan, Luigi Amico, Leon C. Kwek, Frank Hekking, Anna Minguzzi

摘要:

本文研究了紧环阱中超冷玻色原子与人工规范场相互作用时产生的持续电流。利用解析和数值方法,我们研究了持续电流振幅与环的大小的标度。在强相互作用的制度,我们发现一个幂律标度,在很好的协议与Luttinger液体理论的预测。通过探索所有的相互作用制度,我们发现,缩放是最佳的,即电流幅度降低较慢的系统大小,在中间的相互作用。

英文摘要:

We consider the persistent currents induced by an artificial gauge field applied to interacting ultra-cold bosonic atoms in a tight ring trap. Using both analytical and numerical methods, we study the scaling of the persistent current amplitude with the size of the ring. In the strongly interacting regime we find a power-law scaling, in good agreement with the predictions of the Luttinger-liquid theory. By exploring all interaction regimes we find that the scaling is optimal, i.e. the current amplitude decreases slower with the system size, at intermediate interactions.

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