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Decoherence and lead induced inter-dot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach

机译:退相和铅诱导的非平衡点间耦合   通过相互作用的量子点的电子传输:分层量子   主方程方法

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摘要

The interplay between interference effects and electron-electron interactionsin electron transport through an interacting double quantum dot system isinvestigated using a hierarchical quantum master equation approach whichbecomes exact if carried to infinite order and converges well if thetemperature is not too low. Decoherence due to electron-electron interactionsis found to give rise to pronounced negative differential resistance, enhancedbroadening of structures in current-voltage characteristics and an inversion ofthe electronic population. Dependence on gate voltage is shown to be a usefulmethod of distinguishing decoherence-induced phenomena from effects induced byother mechanisms such as the presence of a blocking state. Comparison ofresults obtained by the hierarchical quantum master equation approach to thoseobtained from the Born-Markov approximation to the Nakajima-Zwanzig equationand from the non-crossing approximation to the nonequilibrium Green's functionreveals the importance of an inter-dot coupling that originates from the energydependence of the conduction bands in the leads and the need for a systematicperturbative expansion.
机译:使用分层量子主方程方法研究了在通过相互作用的双量子点系统的电子传输过程中电子的干扰效应和电子相互作用之间的相互作用,如果将其带到无限量级则精确,如果温度不太低则收敛良好。发现由于电子-电子相互作用引起的退相干引起明显的负差分电阻,增强了电流-电压特性中的结构展宽以及电子种群的反转。依赖于栅极电压被证明是一种将退相干引起的现象与其他机制所引起的影响(例如阻塞状态的存在)区分开的有用方法。通过分层量子主方程方法获得的结果与从Born-Markov近似到Nakajima-Zwanzig方程以及从非交叉近似到非平衡格林函数获得的结果进行比较,揭示了点间耦合的重要性,该点间耦合源于原子的能量依赖性。导线中的导带以及需要系统的扰动扩展。

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