纳米量子网络中的电流本征模和退相
Current Eigenmodes and Dephasing in Nanoscopic Quantum Networks
摘要：
使用非平衡Keldysh格林函数形式主义，我们表明，在纳米级量子网络的非平衡电荷输运发生通过{ \it电流本征模}，具有特征的空间模式。我们确定了当前模式和网络的电子结构和拓扑结构之间的微观关系，并证明这些模式可以通过选通或收缩来选择，为在纳米尺度上操纵电荷传输提供了新的场所。最后，减少失相时间导致电流模式从弹道量子网络的电流模式平滑地演变为经典电阻器网络的电流模式。
英文摘要：
Using the non-equilibrium Keldysh Green's function formalism, we show that the non-equilibrium charge transport in nanoscopic quantum networks takes place via {\it current eigenmodes} that possess characteristic spatial patterns. We identify the microscopic relation between the current patterns and the network's electronic structure and topology and demonstrate that these patterns can be selected via gating or constrictions, providing new venues for manipulating charge transport at the nanoscale. Finally, decreasing the dephasing time leads to a smooth evolution of the current patterns from those of a ballistic quantum network to those of a classical resistor network.
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