荷斯坦系统中的定向电流
Directed current in the Holstein system
摘要：
我们提出了一种纠正半经典Holstein模型中电荷输运的机制。它示出，本地化的初始条件，与极化子的解决方案，结合一个非反转对称静态电子现场电位构成的最小先决条件出现的定向电流在下面的周期性晶格系统。特别是，我们证明，对于无偏的空间局部化的初始条件，违反奇偶校验防止存在对反传播的轨迹，从而允许定向电流，尽管运动方程的时间可逆性。证明了长程相干电荷输运的发生。
英文摘要：
We propose a mechanism to rectify charge transport in the semiclassical Holstein model. It is shown that localised initial conditions, associated with a polaron solution, in conjunction with a nonreversion symmetric static electron on-site potential constitute minimal prerequisites for the emergence of a directed current in the underlying periodic lattice system. In particular, we demonstrate that for unbiased spatially localised initial conditions, violation of parity prevents the existence of pairs of counter-propagating trajectories, thus allowing for a directed current despite the time-reversibility of the equations of motion. Occurrence of long-range coherent charge transport is demonstrated.
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