期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2118482119
关键词
Hofstadter's butterfly; twisted bilayer graphene; anisotropy
资金
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division [DE-AC02-76SF00515]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF3429, GBMF9460, GBMF8683]
- Ross M. Brown Family Foundation
- NSF [ECCS-1542152]
- US DOE, Office of Science, BES [DE-SC0019443]
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- U.S. Department of Energy (DOE) [DE-SC0019443] Funding Source: U.S. Department of Energy (DOE)
We present transport measurements of bilayer graphene with a 1.38 degrees interlayer twist. Although we do not observe correlated insulating states or band reorganization, we do observe several highly unusual behaviors in magnetotransport, including large and quadratic magnetoresistance for a large range of densities around half filling of the moire bands, as well as the splitting and bending of magnetoresistance minima corresponding to gaps between Landau levels as a function of density and field. These features appear to be a generic class of experimental manifestations of Hofstadter's butterfly and may provide insight into the emergent states of twisted bilayer graphene.
We present transport measurements of bilayer graphene with a 1.38 degrees interlayer twist. As with other devices with twist angles substantially larger than the magic angle of 1.1 degrees, we do not observe correlated insulating states or band reorganization. However, we do observe several highly unusual behaviors in magnetotransport. For a large range of densities around half filling of the moire bands, magnetoresistance is large and quadratic. Over these same densities, the magnetoresistance minima corresponding to gaps between Landau levels split and bend as a function of density and field. We reproduce the same splitting and bending behavior in a simple tight-binding model of Hofstadter's butterfly on a triangular lattice with anisotropic hopping terms. These features appear to be a generic class of experimental manifestations of Hofstadter's butterfly and may provide insight into the emergent states of twisted bilayer graphene.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据