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Geometric effects in nonequilibrium electron transfer statistics in adiabatically driven quantum junctions

机译:绝热驱动量子结中非平衡电子转移统计中的几何效应

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摘要

Cyclic Pancharatnam-Berry (PB) and adiabatic noncyclic geometric (ANG) effects are investigated in a single electron orbital system connected to two metal contacts with externally driven chemical potential and/or temperatures. The PB contribution doesn't affect the density matrix evolution, but has a quantitative effect on the statistics (fluctuations) of electron transfer. The ANG contribution, on the other hand, affects the net flux across the junction. Unlike the PB, the ANG contribution is nonzero when two parameters are identically driven. Closed analytical expressions are derived for the ANG contribution to the flux, and the PB contribution to the first two leading order fluctuations. Fluctuations can be modified by manipulating the relative phases of the drivings. Interestingly, we find that the fluctuations of the pumped charge do not satisfy the steady state fluctuation theorem in presence of nonzero geometric contribution, but can be recovered for a vanishing geometric contribution even in presence of the external driving.
机译:在连接到具有外部驱动的化学势和/或温度的两个金属触点的单电子轨道系统中,研究了Pancharatnam-Berry循环(PB)和绝热非循环几何(ANG)效应。 PB的贡献不会影响密度矩阵的演化,但会对电子转移的统计(波动)产生定量影响。另一方面,ANG的贡献会影响结两端的净通量。与PB不同,当两个参数被相同地驱动时,ANG的贡献不为零。对于ANG对通量的贡献和PB对前两个前导波动的贡献,得出了封闭的解析表达式。可以通过控制驱动的相对相位来更改波动。有趣的是,我们发现,在存在非零几何贡献的情况下,抽运电荷的波动不满足稳态波动定理,但是即使在外部驱动的情况下,也可以恢复为消失的几何贡献。

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