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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

P. Kühne
Affiliation:
University of Nebraska-Lincoln, 209N Scott Engineering Center, P.O. Box 880511, Lincoln, NE 68588-0511, USA
A. Boosalis
Affiliation:
University of Nebraska-Lincoln, 209N Scott Engineering Center, P.O. Box 880511, Lincoln, NE 68588-0511, USA
C. M. Herzinger
Affiliation:
J. A. Woollam Co. Inc., 645 M Street, Suite 102, Lincoln, NE 68508-2243, U.S.A.
L.O. Nyakiti
Affiliation:
U.S. Naval Research Laboratory, Washington, DC 20374
V.D. Wheeler
Affiliation:
U.S. Naval Research Laboratory, Washington, DC 20374
R.L. Myers-Ward
Affiliation:
U.S. Naval Research Laboratory, Washington, DC 20374
C.R. Eddy
Affiliation:
U.S. Naval Research Laboratory, Washington, DC 20374
D.K. Gaskill
Affiliation:
U.S. Naval Research Laboratory, Washington, DC 20374
M. Schubert
Affiliation:
University of Nebraska-Lincoln, 209N Scott Engineering Center, P.O. Box 880511, Lincoln, NE 68588-0511, USA
T. Hofmann
Affiliation:
University of Nebraska-Lincoln, 209N Scott Engineering Center, P.O. Box 880511, Lincoln, NE 68588-0511, USA
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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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Articles
Copyright
Copyright © Materials Research Society 2013 

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