{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/evidence-of-orbital-ferromagnetism-in-twisted","title":"Evidence of orbital ferromagnetism in twisted bilayer graphene aligned to hexagonal boron nitride","arxiv_id":"2102.04039","date":"2021-02-08","proceeding":null,"authors":["Aaron L. Sharpe","Eli J. Fox","Arthur W. Barnard","Joe Finney","Kenji Watanabe","Takashi Taniguchi","Marc A. Kastner","David Goldhaber-Gordon"],"abstract":"We have previously reported ferromagnetism evinced by a large hysteretic anomalous Hall effect in twisted bilayer graphene (tBLG). Subsequent measurements of a quantized Hall resistance and small longitudinal resistance confirmed that this magnetic state is a Chern insulator. Here we report that, when tilting the sample in an external magnetic field, the ferromagnetism is highly anisotropic. Because spin-orbit coupling is negligible in graphene such anisotropy is unlikely to come from spin, but rather favors theories in which the ferromagnetism is orbital. We know of no other case in which ferromagnetism has a purely orbital origin. For an applied in-plane field larger than $5\\ \\mathrm{T}$, the out-of-plane magnetization is destroyed, suggesting a transition to a new phase.","url_abs":"https://arxiv.org/abs/2102.04039v2","url_pdf":"https://arxiv.org/pdf/2102.04039v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"evidence-of-orbital-ferromagnetism-in-twisted","repo_url":"https://github.com/aaronsharpe/publication_archives","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}