论文标题
Landau-Zener问题中非平衡稳态问题的当前响应：绿色的功能方法非平衡的功能方法
Current response of nonequilibrium steady states in Landau-Zener problem: Nonequilibrium Green's function approach
论文作者
论文摘要
受到强电场的绝缘体中的载体产生的特征是用非扰动指数的隧道概率的Landau-Zener公式。尽管具有多种应用和扩展的历史悠久，但在存在生成的载体的情况下，对非平衡稳态和相关电流反应的研究主要限于到目前为止的数值模拟。在这里，我们开发了一个框架来计算在Fermionic储层存在下，在直流电场下，在直流电场下的非平衡绿色功能。使用渐近扩展技术，我们为绿色功能提供了半定量公式，并具有非扰动贡献。这种形式主义使我们能够计算非平衡稳态的耗散电流响应，事实证明，它不仅是具有与隧道概率成正比的标准电流的特征。我们还将当前的形式主义应用于非中心绝缘体，并提出非偏射电荷和隧道电子特殊的自旋转运。
The carrier generation in insulators subjected to strong electric fields is characterized by the Landau-Zener formula for the tunneling probability with a nonperturbative exponent. Despite its long history with diverse applications and extensions, study of nonequilibrium steady states and associated current response in the presence of the generated carriers has been mainly limited to numerical simulations so far. Here, we develop a framework to calculate the nonequilibrium Green's function of generic insulating systems under a DC electric field, in the presence of a fermionic reservoir. Using asymptotic expansion techniques, we derive a semi-quantitative formula for the Green's function with nonperturbative contribution. This formalism enables us to calculate dissipative current response of the nonequilibrium steady state, which turns out to be not simply characterized by the intraband current proportional to the tunneling probability. We also apply the present formalism to noncentrosymmetric insulators, and propose nonreciprocal charge and spin transport peculiar to tunneling electrons.
