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24 April 2024

» arxiv » 1506.6680

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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 ; Gérard Martinez ;
Date:	22 Jun 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 B>26 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).
Source:	arXiv, 1506.6680
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