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arXiv 1503.03288cond-mat.mes-hall
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界面屏蔽Anderson-Holstein模型的瞬态动力学

Transient dynamics in the Anderson-Holstein model with interfacial screening

E. Perfetto, G. Stefanucci

摘要:

研究了电子-声子耦合和点-铅排斥对Anderson-Holstein模型输运性质的联合影响。我们采用最近提出的非微扰方法来计算系统的瞬态响应。通过改变时间传播的初始条件,电流表现出不同性质的瞬态振荡。我们能够解开两个动力学过程,即由于点铅接触的局部电荷重排和由于施加外部偏压的非平衡多体状态的建立。这些过程涉及弗兰克-康登激发或共振能级和费米能级之间的跃迁。

英文摘要:

We study the combined effects of electron-phonon coupling and dot-lead repulsion in the transport properties of the Anderson-Holstein model. We employ a recently proposed nonperturbative method to calculate the transient response of the system. By varying the initial conditions for the time propagation the current exhibits transient oscillations of different nature. We are able to disentangle two dynamical processes, namely the local charge rearrangement due to the dot-lead contacting and the establishment of the nonequilbrium many-body state due to the application of the external bias. These processes involve either Franck-Condon excitations or transitions between the resonant level and the Fermi energy of the leads.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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