Resonant persistent currents for ultracold bosons on a lattice ring
Resonant persistent currents for ultracold bosons on a lattice ring
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晶格环上超冷玻色子的谐振持续电流
DOI：
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发表时间：
2017
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影响因子：
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通讯作者：
A. Minguzzi
中科院分区：
文献类型：
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作者：
Geva Arwas;D. Cohen;F. Hekking;A. Minguzzi
我们考虑环晶格上的一维玻色子气体，存在局部势垒，并且受到人工规范场的影响。通过精确对角化，我们研究了不同晶格填充值下不同相互作用和势垒强度下的持续电流。虽然一般来说，持续电流在莫特绝缘体相中受到强烈抑制，但当势垒强度达到相互作用能的量级时，它们会表现出谐振行为。我们使用有效的单粒子模型来解释这种现象。我们证明这种效应在有限温度下是稳健的，在持续电流消失的温度范围内。
We consider a one-dimensional bosonic gas on a ring lattice, in the presence of a localized barrier, and under the effect of an artificial gauge field. By means of exact diagonalization we study the persistent currents at varying interactions and barrier strength, for various values of lattice filling. While generically the persistent currents are strongly suppressed in the Mott insulator phase, they show a resonant behaviour when the barrier strength becomes of the order of the interaction energy. We explain this phenomenon using an effective single-particle model. We show that this effect is robust at finite temperature, up the temperature scale where persistent currents vanish.