Effect of dephasing on the current statistics of mesoscopic devices.
Effect of dephasing on the current statistics of mesoscopic devices.
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DOI：
10.1103/physrevlett.93.256803
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发表时间：
2004-07
影响因子：
8.6
通讯作者：
M. Pala;G. Iannaccone
中科院分区：
文献类型：
--
作者：
M. Pala;G. Iannaccone
我们研究了退相对介观导体电流统计的影响，特别是对介观腔和Aharonov-Bohm环的影响。对于这样的设备，我们分析了任意程度的退相干对电流的累积量的影响。我们恢复已知的结果的限制情况下，完全相干和完全不相干的运输，并能够获得详细的信息的中间制度的部分相干性为不同数量的开放通道。我们发现，移相影响的平均电流，散粒噪声，高阶累积量在定量和定性类似的方式，因此散粒噪声或高阶累积量的电流不提供信息的退相干附加或补充什么可以已经从平均电流。
We investigate the effects of dephasing on the current statistics of mesoscopic conductors with a recently developed statistical model, focusing, in particular, on mesoscopic cavities and Aharonov-Bohm rings. For such devices, we analyze the influence of an arbitrary degree of decoherence on the cumulants of the current. We recover known results for the limiting cases of fully coherent and totally incoherent transport and are able to obtain detailed information on the intermediate regime of partial coherence for a varying number of open channels. We show that dephasing affects the average current, shot noise, and higher order cumulants in a quantitatively and qualitatively similar way, and that consequently shot noise or higher order cumulants of the current do not provide information on decoherence additional or complementary to what can be already obtained from the average current.