Temperature effects on magnetoplasmon spectrum of a weakly modulated graphene monolayer

TL;DR

This study investigates how temperature influences the magnetoplasmon spectrum in graphene monolayers and 2DEG, revealing that graphene exhibits more robust oscillations due to its Dirac electron properties and Berry's phase.

Contribution

It provides a comparative analysis of temperature effects on magnetoplasmon spectra in graphene and 2DEG, highlighting the unique phase shift caused by Dirac electrons in graphene.

Findings

Graphene shows stronger, more temperature-robust oscillations than 2DEG.

Both systems exhibit Shubnikov-de Hass and Weiss oscillations.

A $$ phase shift is observed between the systems' magnetoplasmon oscillations.

Abstract

In this work, we determine the effects of temperature on the magnetoplasmon spectrum of an electrically modulated graphene monolayer as well as the two-dimensional electron gas (2DEG). The intra-Landau-band magnetoplasmon spectrum within the Self Consistent Field (SCF) approach is investigated for both the aforementioned systems. Results obtained not only exhibit Shubnikov-de Hass (SdH) oscillations but also commensurability oscillations (Weiss oscillations). These oscillations are periodic as a function of inverse magnetic field. We find that both the magnetic oscillations, SdH and Weiss, have a greater amplitude and are more robust against temperature in graphene compared to conventional 2DEG. Furthermore, there is a $\pi$ phase shift between the magnetoplasmon oscillations in the two systems which can be attributed to Dirac electrons in graphene acquiring a Berry's phase as they traverse a closed path in a magnetic field.