Electrically controllable cyclotron resonance

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.

Automated summary

This paper studies cyclotron resonance in a gated two-dimensional electron system, analyzing its absorption properties and redshift phenomenon, which is found to be dependent on the electron density and controllable by varying the gate voltage. The controllability of cyclotron resonance in gated two-dimensional electron systems opens up new possibilities for exploring this phenomenon in both physics and applications.