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arXiv 2009.07584cond-mat.mes-hall
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弹道二端器件中波包散射延迟的非互易性

Non-Reciprocity of the Wave Packet Scattering Delay in Ballistic Two-Terminal Devices

P. Bredol

摘要:

在线性区,弹道两端器件的输运性质通常被认为与电流的方向无关。这种两端互易性适用于电子透射和反射概率。然而,它不适用于波包的散射延迟。实际上,\emph{four}不同的时间延迟分别描述了从两个终端到达的波包的传输和反射过程。与概率不同,如果散射矩阵的信道交换对称性被破坏,则这些延迟是方向相关的。

英文摘要:

In the linear regime, transport properties of ballistic two-terminal devices are generally considered to be independent of the direction of the current. This two-terminal reciprocity applies to both the electron transmission and reflection probabilities. However, it does not apply to the scattering delays of wave packets. Indeed, \emph{four} different time delays describe the transmission and reflection processes of wave packets arriving from the two terminals, respectively. Unlike the probabilities, these delays are direction dependent if the channel exchange symmetry of the scattering matrix is broken.

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