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arXiv 0804.0430cond-mat.mes-hall
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双势垒结构的动态散射通道

Dynamic scattering channels of a double barrier structure

M. Moskalets, M. Buttiker

摘要:

我们解析计算的Floquet散射矩阵的周期性驱动的双势垒结构。我们的方法考虑到动力学的影响,成为必要的重要时,电子传播通过一个系统受到快速驱动。将Floquet散射振幅表示为对应于电子在结构内部花费的不同时间的振幅之和是方便的。这些振幅定义动态散射通道。然后,我们表示的直流电流产生的结构作为两个通用的贡献之和。第一个是由于同一信道内的光子辅助干扰过程,第二个是由于信道间干扰过程。在零温度下,两种贡献都存在,而在高温和/或高驱动频率下,只有前者幸存。

英文摘要:

We calculate analytically the Floquet scattering matrix for a periodically driven double-barrier structure. Our approach takes into account dynamical effects which become necessarily important when electrons propagate through a system subject to a fast drive. It is convenient to represent the Floquet scattering amplitude as a sum of amplitudes corresponding to different times spent by an electron inside the structure. These amplitudes define dynamical scattering channels. Then we represent the dc current generated by the structure as a sum of two generic contributions. The first one is due to photon-assisted interference processes within the same channel and the second one is due to inter-channel interference processes. At zero temperature both contributions are present while at high temperatures and/or high driving frequencies only the former survives.

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