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Optical Hall effect measurement of coupled phonon mode - Landau Level transitions in epitaxial Graphene on silicon carbide
Published online by Cambridge University Press: 24 June 2013
Abstract
We report on mid-infrared (600 – 4000 cm-1), refection-type optical-Hall effect measurements on epitaxial graphene grown on C-face silicon carbide and present Landau-level transition features detected at 1.5 K as a function of magnetic field up to 8 Tesla. The Landau-level transitions are detected in reflection configuration at oblique incidence for wavenumbers below, across and above the silicon carbide reststrahlen range. Small Landau-level transition features are enhanced across the silicon carbide reststrahlen range due to surface-guided wave coupling with the electronic Landau-level transitions in the graphene layer. We analyze the spectral and magnetic-field dependencies of the coupled resonances, and compare our findings with previously reported Landau-level transitions measured in transmission configuration [4,5,6]. Additional features resemble transitions previously assigned to bilayer inclusion [21], as well as graphite [15]. We discuss a model description to account for the electromagnetic polarizability of the graphene layers, and which is sufficient for quantitative model calculation of the optical-Hall effect data.
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- Information
- MRS Online Proceedings Library (OPL) , Volume 1505: Symposium W – Carbon Nanomaterials , 2013 , mrsf12-1505-w07-44
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- Copyright © Materials Research Society 2013
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