The selection rule of graphene in a composite magnetic field

Y. C. Ou, Y. H. Chiu, P. H. Yang, M. F. Lin

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The generalized tight-binding model with exact diagonalization method is developed to calculate the optical properties of monolayer graphene in the presence of composite magnetic fields. The ratio of the uniform magnetic field and the modulated one accounts for a strong influence on the structure, number, intensity and frequency of absorption peaks, and thus the extra selection rules that are subsequently induced can be explained. When the modulated field increases, each symmetric peak, under a uniform magnetic field, splits into a pair of asymmetric peaks with lower intensities. The threshold absorption frequency exhibits an obvious evolution in terms of a redshift. These absorption peaks obey the same selection rule that is followed by Landau level transitions. Moreover, at a sufficiently strong modulation strength, the extra peaks in the absorption spectrum might arise from different selection rules.

Original languageEnglish
Pages (from-to)7473-7491
Number of pages19
JournalOptics Express
Volume22
Issue number7
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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