Exploration of edge-dependent optical selection rules for graphene nanoribbons

H. C. Chung, M. H. Lee, C. P. Chang, Min-Fa Lin

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Optical selection rules for one-dimensional graphene nanoribbons are explored based on the tight-binding model. A theoretical explanation, through analyzing the velocity matrix elements and the features of the wavefunctions, can account for the selection rules, which depend on the edge structure of the nanoribbon, i.e., armchair or zigzag edges. The selection rule of armchair nanoribbons is ΔJ = Jc -Jv = 0, and the optical transitions occur from the conduction to the valence subbands of the same index. Such a selection rule originates in the relationships between two sublattices and between the conduction and valence subbands. On the other hand, zigzag nanoribbons exhibit the selection rule |ΔJ| = odd, which results from the alternatively changing symmetry property as the subband index increases. Furthermore, an efficient theoretical prediction on transition energies is obtained by the application of selection rules, and the energies of the band-edge states become experimentally attainable via optical measurements.

Original languageEnglish
Pages (from-to)23350-23363
Number of pages14
JournalOptics Express
Volume19
Issue number23
DOIs
Publication statusPublished - 2011 Nov 7

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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