Unusual magnetotransport in twisted bilayer graphene-Reference-Cited by-同舟云学术

Unusual magnetotransport in twisted bilayer graphene

Published:2022-04-11 Issue:16 Volume:119 Page:
ISSN:0027-8424
Container-title:Proceedings of the National Academy of Sciences
language:en
Short-container-title:Proc. Natl. Acad. Sci. U.S.A.

Author:

Finney Joe¹²^ORCID,Sharpe Aaron L.²³,Fox Eli J.¹²,Hsueh Connie L.²³,Parker Daniel E.⁴,Yankowitz Matthew⁵⁶,Chen Shaowen⁴⁷⁸,Watanabe Kenji⁹^ORCID,Taniguchi Takashi¹⁰,Dean Cory R.⁷,Vishwanath Ashvin⁴,Kastner M. A.¹²¹¹^ORCID,Goldhaber-Gordon David¹²

Affiliation:

1. Department of Physics, Stanford University, Stanford, CA 94305

2. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025

3. Department of Applied Physics, Stanford University, Stanford, CA 94305

4. Department of Physics, Harvard University, Cambridge, MA 02138

5. Department of Physics, University of Washington, Seattle, WA 98195

6. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195

7. Department of Physics, Columbia University, New York, NY 10027

8. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027

9. Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan

10. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan

11. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139

Abstract

Significance When two sheets of graphene are twisted to the magic angle of 1.1 ∘ , 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 ∘ , 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.

Funder

U.S. Department of Energy

Gordon and Betty Moore Foundation

National Science Foundation

MEXT Elemental Strategy Initiative

MEXT | Japan Society for the Promotion of Science

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

Link

https://pnas.org/doi/pdf/10.1073/pnas.2118482119