空间非均匀二维电子气中微波感应光电流和光电压磁振荡理论
Theory of the microwave-induced photocurrent and photovoltage magnetooscillations in a spatially non-uniform 2D electron gas
摘要：
最近的实验[S.I. Dorozhkin等人，物理修订信函102，036602（2009）]在具有强非对称接触配置的量子霍尔结构上发现了在没有直流驱动的情况下微波诱导的光电流和光电压磁振荡。我们表明，在辐照样品中的朗道量子化导致违反爱因斯坦的直流电导率和扩散系数之间的关系。然后，在样品中存在内置电场的情况下，微波照射引起光电流信号，该光电流信号作为磁场的函数以由微波频率与回旋频率的比率确定的周期振荡，如在实验中观察到的。
英文摘要：
Recent experiment [S.I. Dorozhkin et al., Phys. Rev. Lett. 102, 036602 (2009)] on quantum Hall structures with strongly asymmetric contact configuration discovered microwave-induced photocurrent and photovoltage magnetooscillations in the absence of dc driving. We show that in an irradiated sample the Landau quantization leads to violation of the Einstein relation between the dc conductivity and diffusion coefficient. Then, in the presence of a built-in electric field in a sample, the microwave illumination causes photo-galvanic signals which oscillate as a function of magnetic field with the period determined by the ratio of the microwave frequency to the cyclotron frequency, as observed in the experiment.
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