Optical absorption of twisted bilayer graphene with interlayer potential asymmetry

Abstract

We investigate the band structure and the optical absorption spectrum of twisted bilayer graphenes with changing interlayer bias and Fermi energy simultaneously. We show that the interlayer bias lifts the degeneracy of the superlattice Dirac point, while the amount of the Dirac point shift is significantly suppressed in small rotation angles, and even becomes opposite to the applied bias. We calculate the optical absorption spectrum in various asymmetric potentials and Fermi energies, and associate the characteristic spectral features with the band structure. The spectroscopic features are highly sensitive to the interlayer bias and the Fermi energy, and widely tunable by the external field effect.

11 pages, 7 figures

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Cited by in corpus (4)

• Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
• Gate tunable optical absorption and band structure of twisted bilayer graphene
• Optical Phonons in Twisted Bilayer Graphene with Gate-Induced Asymmetric Doping
• The electronic band structures and optical absorption spectra for incommensurate twisted few-layers graphene