Disorder-Induced Delocalization in Magic-Angle Twisted Bilayer Graphene
Flat bands in moiré systems are exciting new playgrounds for the generation and study of exotic many-body physics phenomena in low-dimensional materials. Such physics is attributed to the vanishing kinetic energy and strong spatial localization of the flat-band states. Here, we use numerical simulations to examine the electronic transport properties of such flat bands in magic-angle twisted bilayer graphene in the presence of disorder. We find that while a conventional downscaling of the mean free path with increasing disorder strength occurs at higher energies, in the flat bands the mean free path can actually increase with increasing disorder strength. This phenomenon is also captured by the disorder-dependent quantum metric, which is directly linked to the ground state localization. This disorder-induced delocalization suggests that weak disorder may have a strong impact on the exotic physics of magic-angle bilayer graphene and other related moiré systems.
Authors
- Stephan Roche (ORCID: https://orcid.org/0000-0003-0323-4665)
- Aron W. Cummings (ORCID: https://orcid.org/0000-0003-2307-497X)
- Jorge Martínez Romeral (ORCID: https://orcid.org/0009-0004-8140-0299)
- Việt Hùng Nguyễn (ORCID: https://orcid.org/0000-0001-6729-3520)
- Pedro Alcázar Guerrero (ORCID: https://orcid.org/0000-0002-4852-2620)
- José-Hugo Garcia
- Jean-Christophe Charlier
Institutions
- Institució Catalana de Recerca i Estudis Avançats (ES)
- Universitat Autònoma de Barcelona (ES)
- Institut Català de Nanociència i Nanotecnologia (ES)
- UCLouvain (BE)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-26
- DOI
- https://doi.org/10.1103/physrevlett.134.126301
- Citations
- 4
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 2.07
Funders
- Minerva Foundation
- Generalitat de Catalunya
- Fédération Wallonie-Bruxelles
- Ministerio de Ciencia e Innovación
- Fonds de Recherche en Santé Respiratoire
- Office of Science
- Horizon 2020 Framework Programme
- European Regional Development Fund
- Agencia Estatal de Investigación
- Basic Energy Sciences
- Direcció General de Recerca, Generalitat de Catalunya
- H2020 European Research Council