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arXiv 1302.3108cond-mat.mes-hall
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Anderson-Holstein模型的长瞬态动力学

Long transient dynamics in the Anderson-Holstein model out of equilibrium

Klaus Ferdinand Albrecht, Alvaro Martin-Rodero, Rosa Carmina Monreal, Lothar Mühlbacher, Alfredo Levy Yeyati

摘要:

计算了通过强耦合振动模的单能级量子点的含时非平衡电流。采用近似方法讨论了引线与量子点瞬时耦合引起的非平衡实时动力学。该方法是专门为强极化子制度设计的,是基于所谓的极化子隧穿近似。考虑到不同的初始点的职业,我们表明,一个共同的稳定状态达到后的时间远大于典型的电子隧穿时间,由于极化子阻挡效应的点电荷。一个直接的比较与数值精确的数据,显示出良好的协议的时间尺度可访问的图形蒙特卡罗模拟方法。

英文摘要:

We calculate the time dependent nonequilibrium current through a single level quantum dot strongly coupled to a vibrational mode. The nonequilibrium real time dynamics caused by an instantaneous coupling of the leads to the quantum dot is discussed using an approximate method. The approach, which is specially designed for the strong polaronic regime, is based on the so-called polaron tunneling approximation. Considering different initial dot occupations, we show that a common steady state is reached after times much larger than the typical electron tunneling times due to a polaron blocking effect in the dot charge. A direct comparison is made with numerically exact data, showing good agreement for the time scales accessible by the diagrammatic Monte Carlo simulation method.

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