Unusual magnetotransport in twisted bilayer graphene.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35412918.
- Also identified by DOI 10.1073/pnas.2118482119 and PMC identifier 9169859.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
SignificanceWhen two sheets of graphene are twisted to the magic angle of 1.1<sup>∘</sup>, the resulting flat moiré bands can host exotic correlated electronic states such as superconductivity and ferromagnetism. Here, we show transport properties of a twisted bilayer graphene device at 1.38<sup>∘</sup>, far enough above the magic angle that we do not expect exotic correlated states. Instead, we see several unusual behaviors in the device's resistivity upon tuning both charge carrier density and perpendicular magnetic field. We can reproduce these behaviors with a surprisingly simple model based on Hofstadter's butterfly. These results shed light on the underlying properties of twisted bilayer graphene.