振幅无序的振荡驱动下的量子输运

Vatsana Tiwari, Sushanta Dattagupta, Devendra Singh Bhakuni, Auditya Sharma
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引用次数: 0

摘要

我们研究了存在高斯分布随机振幅电场的一维光结合链中非相互作用粒子的动力学,并明确关注量子输运的性质。我们推导出了清洁极限下概率传播者和均方位移的精确表达式,并利用柳维尔算子法对无序情况进行了概括。我们的分析表明,在存在随机静态场的情况下,系统遵循扩散输运;然而,场强的增加会导致输运抑制,从而导致无序诱导的局域化。我们进一步扩展了对随时间变化的无序电场的分析,结果表明,随着场强的增加,平均平方位移的动力学轨迹偏离了抛物线轨迹,这与发生弹道输运的清洁极限不同。
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Quantum transport under oscillatory drive with disordered amplitude
We investigate the dynamics of non-interacting particles in a one-dimensional tight-binding chain in the presence of an electric field with random amplitude drawn from a Gaussian distribution, and explicitly focus on the nature of quantum transport. We derive an exact expression for the probability propagator and the mean-squared displacement in the clean limit and generalize it for the disordered case using the Liouville operator method. Our analysis reveals that in the presence a random static field, the system follows diffusive transport; however, an increase in the field strength causes a suppression in the transport and thus results in disorder-induced localization. We further extend the analysis for a time-dependent disordered electric field and show that the dynamics of mean-squared-displacement deviates from the parabolic path as the field strength increases, unlike the clean limit where ballistic transport occurs.
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