Magnetoplasmon spectrum for asymmetric off-plane structure of dissipative 2D system

TL;DR

This paper analyzes how dissipation and asymmetric off-plane structure affect the magnetoplasmon spectrum in 2D systems, revealing significant frequency shifts and the emergence of relaxational modes, aligning with recent experimental observations.

Contribution

It provides a rigorous analysis incorporating dissipation and asymmetry, extending classical results and explaining new spectral features in 2D magnetoplasmons.

Findings

Dissipation decreases magnetoplasmon frequency at low magnetic fields.

Purely relaxational modes appear within certain disorder ranges.

In strong magnetic fields, the frequency approaches cyclotron resonance line.

Abstract

The rigorous analysis of textbook result(Chiu and Quinn, 1974) gives unexpectedly the dramatic change of magnetoplasmon spectrum taking into account both the arbitrary dissipation and asymmetric off-plane structure of 2D system. For given wave vector the dissipation enhancement leads to decrease(increase) of magnetoplasmon frequency at low(high) magnetic field. At certain range of disorder the purely relaxational mode appears in magnetoplasmon spectrum. In strong magnetic fields the magnetoplasmon frequency falls to cyclotron resonance line even in presence of finite dissipation. The recent observation of 2D magnetoplasmon spectrum is consistent with our findings.