Emerging flat bands in large-angle twisted bi-layer graphene under pressure.
Nanoscale
; 13(20): 9264-9269, 2021 May 27.
Article
en En
| MEDLINE
| ID: mdl-33982743
ABSTRACT
Recent experiments on magic-angle twisted bi-layer graphene have attracted intensive attention due to exotic properties such as unconventional superconductivity and correlated insulation. These phenomena were often found at a magic angle less than 1.1°. However, the preparation of precisely controlled bi-layer graphene with a small magic angle is challenging. In this work, electronic properties of large-angle twisted bi-layer graphene (TBG) under pressure are investigated with density functional theory. We demonstrate that large-angle TBG can display flat bands nearby the Fermi level under pressure, which may also induce interesting properties such as superconductivity which have only been found in small-angle TBG at ambient pressure. The Fermi velocity is found to decrease monotonously with pressure for large twisted angles, e.g., 21.8°. Our work indicates that applying pressure provides opportunities for flat-band engineering in larger angle TBG and supports further exploration in related investigations.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Nanoscale
Año:
2021
Tipo del documento:
Article