The Magnetoplasmon spectrum of a weakly modulated two-dimensional electron gas system

TL;DR

This paper investigates the magnetoplasmon spectrum of a magnetically modulated two-dimensional electron gas, revealing magnetic Weiss oscillations and effects of temperature and combined electric-magnetic modulations on the spectrum.

Contribution

It provides a theoretical analysis of the magnetoplasmon spectrum in MM2DEG, including temperature effects and combined modulation influences, extending prior work on electrically modulated systems.

Findings

Magnetic Weiss oscillations appear in the spectrum due to magnetic modulation.

Temperature influences the magnetoplasmon spectrum significantly.

Relative phase and strength of electric and magnetic modulations alter oscillation behavior.

Abstract

The magnetoplasmon spectrum of a magnetically modulated two-dimensional electron gas (MM2DEG) is investigated. We derive the inter and intra Landau band magnetoplasmon spectrum within the self consistent field approach. The derivation is performed at zero temperature as well as at finite temperature. Results are presented for the inter and intra Landau band magnetoplasmon spectrum as a function of the inverse magnetic field. As a result of magnetic modulation, magnetic Weiss oscillations are found to occur in the magnetoplasmon spectrum. Furthermore, our finite temperature theory facilitates analysis of effects of temperature on the magnetoplasmon spectrum. The results are compared with those obtained for an electrically modulated 2DEG system. In addition, we derive and discuss the effects of simultaneous electric and magnetic modulations on the magnetoplasmon spectrum of 2DEG when the modulations are in phase as well as when they are out of phase. Magnetic oscillations are affected by the relative phase of the two modulations and position of the oscillations depends on the relative strength of the two modulations in the former case while we find complete suppression of Weiss oscillations for particular relative strength of the modulations in the latter case.