Weak localization and universal conductance fluctuations in large-area twisted bilayer graphene
We study diffusive magnetotransport in highly p-doped large area twisted bilayer graphene in 1°, 7°, 9° and 20° samples. We report weak localization in twisted bilayer graphene for the first time. All samples exhibit weak localization, from which we extract the phase coherence length and intervalley scattering lengths, and from that determine that dephasing is caused by electron-electron scattering and intervalley scattering is caused by point defects. We observe signatures of universal conductance fluctuations in the 9° sample, which has high mobility and is near the van Hove singularity. Further improvements in sample quality and applications to large area moire materials will open new avenues to observe quantum interference effects.
Authors
- Debarghya Mallick
- Liang Wu (ORCID: https://orcid.org/0000-0002-9988-8593)
- Cheol‐Joo Kim (ORCID: https://orcid.org/0000-0002-4312-3866)
- Matthew Brahlek (ORCID: https://orcid.org/0000-0003-2900-0648)
- Spenser Talkington (ORCID: https://orcid.org/0000-0003-0441-6030)
- E. J. Melé (ORCID: https://orcid.org/0000-0001-7140-5353)
- Shaffique Adam (ORCID: https://orcid.org/0000-0002-3095-9920)
- Seong‐Jun Yang (ORCID: https://orcid.org/0000-0002-7221-0918)
- An‐Hsi Chen (ORCID: https://orcid.org/0000-0002-0339-9657)
- Benjamin F. Mead (ORCID: https://orcid.org/0009-0007-8777-4576)
Institutions
- Pohang University of Science and Technology (KR)
- Oak Ridge National Laboratory (US)
- National University of Singapore (SG)
- Washington University in St. Louis (US)
- California University of Pennsylvania (US)
- Institute for Basic Science (KR)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2026-03-31
- DOI
- https://doi.org/10.1103/xv5t-qvcm
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Materials Sciences and Engineering Division
- National Science Foundation
- U.S. Department of Energy
- Alfred P. Sloan Foundation
- University of Pennsylvania
- Institute for Basic Science
- Office of Science
- Basic Energy Sciences
- Army Research Office