title: Temperature effects on the magnetoplasmon spectrum of a weakly modulated graphene monolayer.
abstract: In this work, we determine the effects of temperature on the magnetoplasmon spectrum of an electrically modulated graphene monolayer as well as a two-dimensional electron gas (2DEG). The intra-Landau band magnetoplasmon spectrum within the self-consistent field approach is investigated for both the aforementioned systems. Results obtained not only exhibit Shubnikov-de Haas (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 a conventional 2DEG. Furthermore, there is a π 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.
authors: Department of Physics, University of Sargodha, Sargodha, Pakistan. m.tahir@uos.edu.pk
authors: M
authors: M
authors: Tahir
authors: K
authors: K
authors: Sabeeh
authors: A
authors: A
authors: MacKinnon