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Multicomponent magneto-optical conductivity of multilayer graphene on SiC

I. Crassee, J. Levallois, D. van der Marel, A. L. Walter, Th. Seyller, and A. B. Kuzmenko
Phys. Rev. B 84, 035103 – Published 15 July 2011

Abstract

Far-infrared diagonal and Hall conductivities of multilayer epitaxial graphene on the C face of SiC were measured using magneto-optical absorption and Faraday rotation in magnetic fields up to 7 T and temperatures between 5 and 300 K. Multiple components were identified in the spectra, including (i) a quasiclassical cyclotron resonance, originating from the highly doped graphene layer closest to SiC, (ii) transitions between low-index Landau levels (LLs), which stem from weakly doped layers, and (iii) a broad optical absorption background. Electron- and hole-type LL transitions are optically distinguished and shown to coexist. An electron-hole asymmetry of the Fermi velocity of about 2% was found within one graphene layer, while the Fermi velocity varies by about 10% across the layers. The optical intensity of the LL transitions is several times smaller than is theoretically expected for isolated graphene monolayers without electron-electron and electron-phonon interactions.

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  • Received 18 April 2011

DOI:https://doi.org/10.1103/PhysRevB.84.035103

©2011 American Physical Society

Authors & Affiliations

I. Crassee1, J. Levallois1, D. van der Marel1, A. L. Walter2,3, Th. Seyller4, and A. B. Kuzmenko1

  • 1Département de Physique de la Matière Condensée, Université de Genève, CH-1211 Genève 4, Switzerland
  • 2Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
  • 3E. O. Lawrence Berkeley National Laboratory, Advanced Light Source, MS6-2100, Berkeley, California 94720, USA
  • 4Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, D-91058 Erlangen, Germany

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Issue

Vol. 84, Iss. 3 — 15 July 2011

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