液氦上光激发电子气的磁振荡和反常电流态
Magneto-oscillations and anomalous current states in a photo-excited electron gas on liquid helium
摘要：
本文综述了最近在液氦自由表面上形成的二维电子系统中所观察到的一类新现象。二维电子系统是在一个垂直于微波辐射的磁场中形成的。这些非平衡现象的显著特征是由子带间（面外）和子带内（面内）微波激发引起的磁导率振荡。由子带内激发引起的电导磁振荡类似于半导体异质结构中的微波诱导电阻振荡（MIRO）。微波诱导的电导振荡（MICO）的研究有助于理解MIRO的起源。更强的微波诱导的电导振荡被观察到，并在理论上很好地描述了谐振子带间微波激发。在强功率下，这种激发导致零电阻状态（ZRS），电子的平面内重新分布，自生音频振荡和不可压缩状态。这些现象是由共振微波激发下形成的二维电子系统的异常电流状态引起的。
英文摘要：
The paper reviews a novel class of phenomena observed recently in the two-dimensional (2D) electron system formed on the free surface of liquid helium in the presence of a magnetic field directed normally and exposed to microwave radiation. The distinctive feature of these nonequilibrium phenomena is magnetoconductivity oscillations induced by inter-subband (out-of-plane) and intra-subband (in-plane) microwave excitations. The conductivity magneto-oscillations induced by intra-subband excitation are similar to remarkable microwave-induced resistance oscillations (MIRO) reported for semiconductor heterostructures. Investigations of microwave-induced conductivity oscillations (MICO) on liquid helium helped with understanding of the origin of MIRO. Much stronger microwave-induced conductivity oscillations were observed and well described theoretically for resonant inter-subband microwave excitation. At strong powers, such excitation leads to zero-resistance states (ZRS), the in-plane redistribution of electrons, self-generated audio-frequency oscillations, and incompressible states. These phenomena are caused by unusual current states of the 2D electron system formed under resonant microwave excitation.
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