非对称耦合量子点中的瞬态电流
Transient current in a quantum dot asymmetrically coupled to metallic leads
摘要：
本文用含时非交叉近似方法研究了单电子晶体管中点能级能量突变引起的双引线非对称连接的瞬态电流。我们发现，对于非对称耦合，尖锐的功能，在状态密度的引线可以诱导振荡的电流通过点。这些振荡持续的时间尺度比电荷波动的时间尺度长得多。振荡的幅度随着点上的温度或源极-漏极偏置的降低而增加，并且对于低于近藤温度的值饱和。我们讨论了这些振荡的微观起源，并评论其实验检测的可能性。
英文摘要：
The time-dependent non-crossing approximation is used to study the transient current in a single electron transistor attached asymmetrically to two leads following a sudden change in the energy of the dot level. We show that for asymmetric coupling, sharp features in the density of states of the leads can induce oscillations in the current through the dot. These oscillations persist to much longer timescales than the timescale for charge fluctuations. The amplitude of the oscillations increases as the temperature or source-drain bias across the dot is reduced and saturates for values below the Kondo temperature. We discuss the microscopic origin of these oscillations and comment on the possibility for their experimental detection.
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