Optical properties and Landau quantisations in twisted bilayer graphene

Chih Wei Chiu, Chang Ting Liu, Chiun Yan Lin, Ming Fa Lin

Research output: Contribution to journalArticlepeer-review

Abstract

The optical properties and Landau quantisations in twisted bilayer graphene are investigated using a generalised tight-binding model that takes into account all interlayer and intralayer atomic interactions in the Moire superlattice. The system is a zero-gap semiconductor with double-degenerate Dirac-cone structures, and saddle-point energy dispersions appear at low energies for small twisting angles. The magnetic quantisation phenomena in this system are rich and unique, with Landau-level subgroups specified owing to specific Moire zone folding through modulation of the stacking angles. The Landau-level spectrum shows hybridised characteristics associated with those in monolayer, as well as AA and AB stackings. The detailed analysis explores the complex relations among the different sublattices on the same and different graphene layers.

Original languageEnglish
Pages (from-to)180-204
Number of pages25
JournalPhilosophical Magazine
Volume104
Issue number3
DOIs
Publication statusPublished - 2024

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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