常规准二维纯电子系统的哈密顿棘轮
Hamiltonian ratchet of conventional pure quasi-2D electron system
摘要：
我们跟踪一个简单的机械模型的棘轮，并嵌入其设置在一个传统的准二维电子系统中的半导体异质结构。表达的是两个不同的微观机制，这样的系统，以作为量子棘轮生产面内定向电流从零平均时间相关的电场。有效质量交换棘轮是基于通过改变电子的有效质量来调制迁移率。有效面内电场强度的调制标志着趋肤效应棘轮。它们可以产生线性和圆形的光电流，后者发生在无耗散的制度。
英文摘要：
We trace a simple mechanical model of a ratchet, and embed its setup in a conventional quasi-two-dimensional electron system in a semiconductor heterostructure. Expressed are two distinct microscopic mechanisms for such systems to serve as quantum ratchets producing the in-plane directed current from zero-mean time-dependent electric fields. The effective-mass swap ratchet is based on modulation of the mobility through alteration of the electron's effective mass. Modulation of the strength of the effective in-plane electric field marks the skin-effect ratchet. They can generate both linear and circular photocurrents, the later taking place in the dissipationless regime.
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