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Transient and finite-size effects in transport properties of a quantum wire

机译:量子线传输特性中的瞬态和有限尺寸效应

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We study the time-dependent backscattered current produced in a quantum wire when a local barrier is suddenly switched on. Previous investigations are improved by taking into account the finite length of the device. We establish two different regimes in terms of the relationship between the energy scales associated with the voltage and the length of the system. We show how previous results, valid for wires of infinite length, are modified by the finite size of the system. In particular, our study reveals a rich pattern of temporal steps within which the current suffers an initial relaxation followed by temporary revivals. By employing both analytical and numerical methods we describe peculiar features of this structure. From this analysis one concludes that our results render a recently proposed approach to the determination of the Luttinger parameter, A", more realistic.
机译:我们研究了当局部势垒突然打开时量子线中产生的时间相关的反向散射电流。考虑到设备的有限长度,可以改善先前的研究。根据与电压相关的能级与系统长度之间的关系,我们建立了两种不同的机制。我们展示了如何通过系统的有限大小来修改对无限长导线有效的先前结果。尤其是,我们的研究揭示了一种丰富的时间步态模式,其中电流经历了最初的松弛,随后又暂时恢复。通过采用分析和数值方法,我们描述了这种结构的特殊特征。从这一分析得出的结论是,我们的结果使确定Luttinger参数A“的最新方法更为现实。

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