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Weak localization and universal conductance fluctuations in large-area twisted bilayer graphene

Year: 2026
Type: article
Abstract: 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.
DOI: 10.1103/xv5t-qvcm
Authors: Spenser Talkington, Debarghya Mallick, An-Hsi Chen, Benjamin F. Mead, Seong-Jun Yang, Cheol-Joo Kim, Shaffique Adam, Liang Wu, Matthew Brahlek, Eugene J. Mele
Institutions: University of Pennsylvania, Oak Ridge National Laboratory, Pohang University of Science and Technology, Institute for Basic Science, National University of Singapore, Washington University in St. Louis
Language: English
Open Access status: green
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
Awards: G2164890142, G222768804, G2608336305, G3072816452, Graduate Research Fellowship Program(GRFP), INTRINSIC SURFACE PHONONS ON RECONSTRUCTED SEMICONDUCTOR SURFACES, ELECTRONIC AND PIEZOELECTRIC PHENOMENA IN NANOSTRUCTURES, G5263068339, G5648016710, G6904868419, G7108450392, G7452299184, G79234507
OpenAlex ID: W4416159269
FWCI: 1.385
Cites: 132
Cited by: 1
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