Magneto-Oscillations and Anomalous Current States in a Photoexcited Electron Gas on Liquid Helium
Magneto-Oscillations and Anomalous Current States in a Photoexcited Electron Gas on Liquid Helium
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液氦光激电子气中的磁振荡和反常电流状态
DOI：
10.1007/s10909-019-02210-w
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发表时间：
2019
影响因子：
2
通讯作者：
Denis Konstantinov
中科院分区：
文献类型：
--
作者：
Y. Monarkha;Denis Konstantinov
本文综述了最近在液氦自由表面上在正常磁场引导下和微波辐射下形成的二维电子系统中观察到的一类新现象。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。子带内激发引起的电导率磁振荡与半导体异质结构中显著的微波诱导电阻振荡（MIRO）相似。研究微波诱导的液氦电导率振荡有助于理解MIRO的起源。在子带间微波共振激发下，观察到更强的微波诱导电导率振荡，并在理论上得到了很好的描述。在强功率下，这种激励导致零电阻状态、电子在平面内重新分布、自产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。
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 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, 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.