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Magneto‐Optical Absorption in Graphene Superlattices: Dirac Point Effects
Author(s) -
de DiosLeyva Melquiades,
HernándezBertrán Michael Alejandro,
Morales Álvaro Luis,
Duque Carlos Alberto
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201700347
Subject(s) - superlattice , graphene , condensed matter physics , dirac (video compression format) , physics , polarization (electrochemistry) , absorption (acoustics) , magneto optical , magnetic field , monolayer , materials science , quantum mechanics , chemistry , optics , nanotechnology , neutrino
We investigate the effects of Dirac points on the magneto‐optical absorption of graphene superlattices (SLs) in a weak perpendicular magnetic field. It is shown that the absorption spectrum exhibits a resonant peak structure whose characteristics depend on the properties and number of these points. For SLs with only one Dirac point, the spectrum consists of resonant peaks satisfying the same selection rule as that for monolayer graphene, except for one of these peaks. For SLs with extra Dirac points, the resonant peaks arise from transition between singlet subbands or between doublet subbands and satisfy a circular polarization and peak intensity dependent selection rule.