Cyclotron resonance (CR) is considered one of the fundamental phenomena in conducting systems. In this paper, we study CR in a gated two-dimensional (2D) electron system (ES). Namely, we analyze the absorption of electromagnetic radiation incident normal to the gated 2DES, where a standard dielectric substrate separates the 2D electron sheet and the metallic steering electrode (“gate”) the whole system is placed in the perpendicular magnetic field. Our analysis reveals the redshift of the absorption peak frequency compared to the electron cyclotron frequency. The redshift appears in the low-frequency regime, when the resonant frequency is much less than the frequency of Fabry-Perot modes in the natural resonator “2D electron sheet – substrate – gate.” Moreover, we find this shift to be dependent on the electron density of 2DES. Therefore, it can be controlled by varying the gate voltage. We predict that the shift can be large in realistic gated or back-gated 2DESs. The obtained controllability of CR in gated 2DES opens the door for exploring new physics and applications of this phenomenon.

中文翻译：

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电控回旋共振

回旋加速器共振（CR）被认为是导电系统中的基本现象之一。在本文中，我们研究了门控二维（2D）电子系统（ES）中的CR。即，我们分析垂直于门控2DES入射的电磁辐射的吸收，其中标准电介质衬底将2D电子片和金属操纵电极（“门”）分开，整个系统置于垂直磁场中。我们的分析揭示了与电子回旋加速器频率相比吸收峰频率的红移。当共振频率远小于自然共振器“ 2D电子片-基板-栅极”中的Fabry-Perot模频率时，红移出现在低频状态。此外，我们发现这种变化取决于2DES的电子密度。所以，它可以通过改变栅极电压来控制。我们预测，在实际的门控或后门2DES中，偏移可能很大。在门控2DES中获得的CR可控性为探索这一现象的新物理方法和应用打开了大门。