Infrared absorption of closely-aligned heterostructures of monolayer and bilayer graphene with hexagonal boron nitride

D. S. L. Abergel, Marcin Mucha-Kruczynski

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Abstract

We model optical absorption of monolayer and bilayer graphene on hexagonal boron nitride for the case of closely-aligned crystal lattices. We show that perturbations with different spatial symmetry can lead to similar absorption spectra. We suggest that a study of the absorption spectra as a function of the doping for almost completely full first miniband is necessary to extract meaningful information about the moire characteristics from optical absorption measurements and to distinguish between various theoretical proposals for the physically realistic interaction. Also, for bilayer graphene, the ability to compare spectra for the opposite signs of electric-field-induced interlayer asymmetry might provide additional information about the moire parameters.
Original languageEnglish
Article number115430
Number of pages6
JournalPhysical Review B : Condensed Matter and Materials Physics
Volume92
Issue number11
Early online date18 Sep 2015
DOIs
Publication statusPublished - Sep 2015

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