Density functional theory calculations of the electric-field-induced Dirac cones and quantum valley Hall state in ABA-stacked trilayer graphene
- Authors
- Lee, Kyu Won; Lee, Cheol Eui
- Issue Date
- 10-12월-2015
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.92, no.24
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 92
- Number
- 24
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/91588
- DOI
- 10.1103/PhysRevB.92.245416
- ISSN
- 1098-0121
- Abstract
- We have investigated ABA-stacked trilayer graphene under a perpendicular electric field by using the density functional theory (DFT) calculations, which may contribute to the resolution of the discrepancies between experimental and theoretical results on the electric-field-induced band gap and topological phase transition. We found that the electric field opens a band gap at a low field and closes the gap at a high field, supporting one of the experimental results. While the seven electric-field-induced Dirac cones with mass gaps predicted in recent tight-binding (TB) models are confirmed, our DFT calculations demonstrate a phase transition from a quantum valley Hall insulator to a semimetal, contrasting to the TB model prediction of a topological phase transition between topologically nontrivial insulators at a high electric field.
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