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arXiv 1402.0637cond-mat.mes-hall
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超越级联衰变模型的可调势垒非绝热电子泵模型

Modeling of a tunable-barrier non-adiabatic electron pump beyond the decay cascade model

Vyacheslavs Kashcheyevs, Janis Timoshenko

摘要:

推广了量子点退耦阶段由背隧误差控制的可调势垒非绝热电子泵的电荷俘获统计的级联衰减模型。控制准确的陷阱电荷量子化的热机制和动力学机制之间的竞争的能量尺度进行了讨论。提出了一个包含量子点重新布居误差的经验拟合公式,并在一个可精确求解的速率方程模型下进行了检验。

英文摘要:

We generalize the decay cascade model of charge capture statistics for a tunable-barrier non-adiabatic electron pump dominated by the backtunneling error at the quantum dot decoupling stage. The energy scales controlling the competition between the thermal and the dynamical mechanisms for accurate trapped charge quantization are discussed. Empirical fitting formula incorporating quantum dot re-population errors due to particle-hole fluctuations in the source lead is suggested and tested against an exactly solvable rate equation model.

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