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arXiv 1507.00152cond-mat.mes-hall
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通过DC传输探测(拓扑)Floquet状态

Probing (topological) Floquet states through DC transport

Michel Fruchart, Pierre Delplace, Joseph Weston, Xavier Waintal, David Carpentier

摘要:

我们考虑了连接到无限电极的周期驱动系统的微分电导。我们专注于耗散主要发生在这些电极的情况。使用分析参数和详细的数值研究,我们涉及到这样一个系统的微分电导在两个和三个终端的几何形状的Floquet运营商的准能量的频谱。此外,这些差分电导被发现提供了一个准确的探针的存在的间隙在这个准能谱,被量化时,拓扑边缘状态发生在这些间隙。我们的分析打开的角度来描述驱动介观导体的拓扑Floquet滤波器的中间时间动力学。

英文摘要:

We consider the differential conductance of a periodically driven system connected to infinite electrodes. We focus on the situation where the dissipation occurs predominantly in these electrodes. Using analytical arguments and a detailed numerical study we relate the differential conductances of such a system in two and three terminal geometries to the spectrum of quasi-energies of the Floquet operator. Moreover these differential conductances are found to provide an accurate probe of the existence of gaps in this quasi-energy spectrum, being quantized when topological edge states occur within these gaps. Our analysis opens the perspective to describe the intermediate time dynamics of driven mesoscopic conductors as topological Floquet filters.

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