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.

DOI: 10.1088/0953-8984/23/42/425304

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Cite this paper

@article{Tahir2011TemperatureEO, title={Temperature effects on the magnetoplasmon spectrum of a weakly modulated graphene monolayer.}, author={Mary Tahir and Kashif Sabeeh and Angus Mackinnon}, journal={Journal of physics. Condensed matter : an Institute of Physics journal}, year={2011}, volume={23 42}, pages={425304} }