Abstract
Refined infrared magnetotransmission experiments have been performed in magnetic fields up to 35 T on a series of multilayer epitaxial graphene samples. Following the main optical transition involving the Landau level (LL), we observe a new absorption transition increasing in intensity with magnetic fields T. Our analysis shows that this is a signature of the breaking of the SU(4) symmetry of the LL. Using a quantitative model, we show that the only symmetry-breaking scheme consistent with our experiments is a charge density wave (CDW).
2 More- Received 20 October 2014
- Revised 22 May 2015
DOI:https://doi.org/10.1103/PhysRevB.91.235122
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