Electrically controllable cyclotron resonance

Physical Review B: Condensed Matter and Materials Physics. 2021. Vol. 103. Article 125301.

Zabolotnykh A., Волков В. А.

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.

Keywords: электронный циклотронный резонанс, two-dimensional electron systems, двумерные электронные системы, cyclotron resonance