Optical absorption of twisted bilayer graphene with interlayer potential asymmetry

Pilkyung Moon, Young Woo Son, Mikito Koshino

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

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.

Original languageEnglish
Article number155427
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number15
DOIs
Publication statusPublished - 2014 Oct 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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