SU(4) symmetry breaking revealed by magneto-optical spectroscopy in epitaxial graphene

Liang Z. Tan, Milan Orlita, Marek Potemski, James Palmer, Claire Berger, Walter A. de Heer, Steven G. Louie, and Gérard Martinez
Phys. Rev. B 91, 235122 – Published 12 June 2015

Abstract

Refined infrared magnetotransmission experiments have been performed in magnetic fields B up to 35 T on a series of multilayer epitaxial graphene samples. Following the main optical transition involving the n=0 Landau level (LL), we observe a new absorption transition increasing in intensity with magnetic fields B26 T. Our analysis shows that this is a signature of the breaking of the SU(4) symmetry of the n=0 LL. Using a quantitative model, we show that the only symmetry-breaking scheme consistent with our experiments is a charge density wave (CDW).

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  • Received 20 October 2014
  • Revised 22 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.235122

©2015 American Physical Society

Authors & Affiliations

Liang Z. Tan1, Milan Orlita2,3, Marek Potemski2, James Palmer4, Claire Berger4,5, Walter A. de Heer4, Steven G. Louie1,*, and Gérard Martinez2

  • 1Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, B.P. 166, 38042 Grenoble Cedex 9, France
  • 3Institute of Physics, Charles University, Ke Karlovu 5, CZ-121 16 Praha 2, Czech Republic
  • 4School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
  • 5Institut Néel, CNRS-UJF B.P. 166, 38042 Grenoble Cedex 9, France

  • *Corresponding author: sglouie@berkeley.edu

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Vol. 91, Iss. 23 — 15 June 2015

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