Single-parameter nonadiabatic quantized charge pumping
Single-parameter nonadiabatic quantized charge pumping
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DOI：
10.1103/physrevb.77.153301
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发表时间：
2008-04-01
影响因子：
3.7
通讯作者：
Schumacher, H. W.
中科院分区：
文献类型：
--
作者：
Kaestner, B.;Kashcheyevs, V.;Schumacher, H. W.
对单参数调制的AlGaAs/GaAs门控纳米线中的受控电荷泵浦进行了实验和理论研究。每个调制周期的基本电荷的整数倍的转移被清楚地证明。一个简单的理论模型表明，这种量子化电流可以通过加载和卸载动态准束缚状态来产生。结果表明，非绝热封锁不需要的隧道事件可以消除至少有两个相移周期信号的要求，以实现量化泵浦。
Controlled charge pumping in an AlGaAs/GaAs gated nanowire by single-parameter modulation is experimentally and theoretically studied. Transfer of integral multiples of the elementary charge per modulation cycle is clearly demonstrated. A simple theoretical model shows that such a quantized current can be generated via loading and unloading of a dynamic quasibound state. It demonstrates that nonadiabatic blockade of unwanted tunnel events can obliterate the requirement of having at least two phase-shifted periodic signals to realize quantized pumping.