Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-07-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures, Accepted in J. Phys. Condensed matter
Scientific paper
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.
MacKinnon Alec
Sabeeh Kashif
Tahir Muhammad
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