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Dirac spectroscopy of strongly correlated phases in twisted trilayer graphene.

التفاصيل البيبلوغرافية
العنوان: Dirac spectroscopy of strongly correlated phases in twisted trilayer graphene.
المؤلفون: Shen C; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain. cheng.shen@icfo.eu., Ledwith PJ; Department of Physics, Harvard University, Cambridge, MA, USA., Watanabe K; National Institute for Materials Science, Tsukuba, Japan., Taniguchi T; National Institute for Materials Science, Tsukuba, Japan., Khalaf E; Department of Physics, Harvard University, Cambridge, MA, USA., Vishwanath A; Department of Physics, Harvard University, Cambridge, MA, USA., Efetov DK; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain. dmitri.efetov@lmu.de.; Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany. dmitri.efetov@lmu.de.; Munich Center for Quantum Science and Technology (MCQST), München, Germany. dmitri.efetov@lmu.de.
المصدر: Nature materials [Nat Mater] 2023 Mar; Vol. 22 (3), pp. 316-321. Date of Electronic Publication: 2022 Dec 22.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Nature Pub. Group Country of Publication: England NLM ID: 101155473 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1476-4660 (Electronic) Linking ISSN: 14761122 NLM ISO Abbreviation: Nat Mater Subsets: PubMed not MEDLINE; MEDLINE
أسماء مطبوعة: Original Publication: London, UK : Nature Pub. Group, [2002]-
مستخلص: Magic-angle twisted trilayer graphene (MATTG) hosts flat electronic bands, and exhibits correlated quantum phases with electrical tunability. In this work, we demonstrate a spectroscopy technique that allows for dissociation of intertwined bands and quantification of the energy gaps and Chern numbers C of the correlated states in MATTG by driving band crossings between Dirac cone Landau levels and energy gaps in the flat bands. We uncover hard correlated gaps with C = 0 at integer moiré unit cell fillings of ν = 2 and 3 and reveal charge density wave states originating from van Hove singularities at fractional fillings ν = 5/3 and 11/3. In addition, we demonstrate displacement-field-driven first-order phase transitions at charge neutrality and ν = 2, which are consistent with a theoretical strong-coupling analysis, implying C 2 T symmetry breaking. Overall, these properties establish a diverse electrically tunable phase diagram of MATTG and provide an avenue for investigating other related systems hosting both steep and flat bands.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
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تواريخ الأحداث: Date Created: 20221222 Date Completed: 20230303 Latest Revision: 20230303
رمز التحديث: 20230303
DOI: 10.1038/s41563-022-01428-6
PMID: 36550373
قاعدة البيانات: MEDLINE
الوصف
تدمد:1476-4660
DOI:10.1038/s41563-022-01428-6