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首页> 外文会议>International Conference on High Magnetic Fields in Semiconductor Physics; 20040802-06; Tallahassee,FL(US) >ABSORPTION AND REFLECTION EXPERIMENTS ON HIGH-MOBILITY 2DEGs IN THE REGIME OF MICROWAVE-INDUCED RESISTANCE OSCILLATIONS
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ABSORPTION AND REFLECTION EXPERIMENTS ON HIGH-MOBILITY 2DEGs IN THE REGIME OF MICROWAVE-INDUCED RESISTANCE OSCILLATIONS

机译：微波诱导的电阻振荡系统中高流动性2DEs的吸收和反射实验

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摘要

We have performed microwave absorption and near-field reflection experiments on a high mobility GaAs/AlGaAs heterostructure for the same conditions for which Microwave-Induced Resistance Oscillations (MIROs) are observed. It is shown that the electro-dynamic aspect of the problem is important in these experiments. In the absorption experiments a broad CR line was observed due to a large reflection from the highly conductive electron gas. There were no additional features observed related to absorption at harmonics of the cyclotron resonance. In near-field reflection experiments a very different oscillation pattern was revealed when compared to MIROs. The oscillation pattern observed in the reflection experiments is probably due to plasma effects occurring in a finite-size sample. The whole microscopic picture of MIROs is more complicated than simply a resonant absorption at harmonics of the cyclotron resonance. Nevertheless, the experimental observations are in good agreement with the model by Durst et al. involving the photo-assisted scattering in the presence of a crossed magnetic field and dc bias. The observed damping factor of MIROs may be attributed to a change in the electron mobility as a function of temperature. MIROs may be considered as a light-induced drift effect, a broad class of phenomena associated with a light-induced asymmetry in the velocity distribution function.
机译：我们已经在观察到微波感应电阻振荡（MIRO）的相同条件下，对高迁移率GaAs / AlGaAs异质结构进行了微波吸收和近场反射实验。结果表明，问题的电动力学方面在这些实验中很重要。在吸收实验中，由于高导电性电子气体的大量反射，观察到了宽CR线。没有观察到与回旋共振谐波吸收有关的其他特征。与MIRO相比，在近场反射实验中发现了非常不同的振荡模式。在反射实验中观察到的振荡模式可能是由于在有限大小的样品中发生了等离子体效应。 MIRO的整个显微图像要比回旋加速器谐振的谐波吸收简单得多。然而，实验观察结果与Durst等人的模型非常吻合。涉及在交叉磁场和直流偏置存在下的光辅助散射。观察到的MIRO阻尼因子可归因于电子迁移率随温度的变化。 MIRO可以看作是光引起的漂移效应，是与速度分布函数中的光引起的不对称性相关的广泛现象。

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