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  Multiflat Bands and Strong Correlations in Twisted Bilayer Boron Nitride: Doping-Induced Correlated Insulator and Superconductor

Xian, L. D., Kennes, D. M., Tancogne-Dejean, N., Altarelli, M., & Rubio, A. (2019). Multiflat Bands and Strong Correlations in Twisted Bilayer Boron Nitride: Doping-Induced Correlated Insulator and Superconductor. Nano Letters, 19(8), 4934-4940. doi:10.1021/acs.nanolett.9b00986.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0003-A017-E Version Permalink: https://hdl.handle.net/21.11116/0000-000B-A8F3-5
Genre: Journal Article

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Calculational details, model analysis of general twist bilayer systems with massive Dirac Hamiltonian, twist angle dependency of the doping density required to achieve half-filling in TBBN, DFT band structures of unrelaxed TBBN with different twist angles, and polynomial fitting of the bandwidth of the top of valence bands in unrelax TBBN
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Electronic Supporting Information files are available without a subscription to ACS Web Editions. The American Chemical Society holds a copyright ownership interest in any copyrightable Supporting Information. Files available from the ACS website may be downloaded for personal use only. Users are not otherwise permitted to reproduce, republish, redistribute, or sell any Supporting Information from the ACS website, either in whole or in part, in either machine-readable form or any other form without permission from the American Chemical Society. For permission to reproduce, republish and redistribute this material, requesters must process their own requests via the RightsLink permission system. Information about how to use the RightsLink permission system can be found at http://pubs.acs.org/page/copyright/permissions.html.
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 Creators:
Xian, L. D.1, Author           
Kennes, D. M.2, Author
Tancogne-Dejean, N.1, Author           
Altarelli, M.1, Author           
Rubio, A.1, 3, 4, Author           
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, ou_persistent22              
3Nano-Bio Spectroscopy Group and ETSF, Universidad del País Vasco UPV/EHU, ou_persistent22              
4Center for Computational Quantum Physics (CCQ),The Flatiron Institute, ou_persistent22              

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 Abstract: Two-dimensional materials, obtained by van der Waals stacking of layers, are fascinating objects of contemporary condensed matter research, exhibiting a variety of new physics. Inspired by the breakthroughs of twisted bilayer graphene (TBG), we demonstrate that twisted bilayer boron nitride (TBBN) is an even more exciting novel system that turns out to be an excellent platform to realize new correlated phases and phenomena; exploration of its electronic properties shows that in contrast to TBG in TBBN multiple families of 2,4, and 6-fold degenerate flat bands emerge without the need to fine tune close to a “magic angle”, resulting in dramatic and tunable changes in optical properties and exciton physics, and providing an additional platform to study strong correlations. Upon doping, unforeseen new correlated phases of matter (insulating and superconducting) emerge. TBBN could thus provide a promising experimental platform, insensitive to small deviations in the twist angle, to study novel exciton condensate and spatial confinement physics, and correlations in two dimensions.

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Language(s): eng - English
 Dates: 2019-06-222019-03-082019-07-012019-08-14
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 1812.08097
DOI: 10.1021/acs.nanolett.9b00986
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Project name : -
Grant ID : 709382
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : The authors thank Martin Claassen and Mei-Yin Chou for useful discussions. This work was supported by the European Research Council (ERC-2015-AdG694097). The Flatiron Institute is a division of the Simons Foundation. L.X. acknowledges the European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement number 709382 (MODHET). D.M.K. acknowledges funding from the Deutsche Forschungsgemeinschaft through the Emmy Noether program (KA 3360/2-1). FRG calculations were performed with computing resources granted by RWTH Aachen University under projects prep0010. We acknowledge computing resources from the Garching supercomputing center of the Max Planck Society as well as Columbia University’s Shared Research Computing Facility project, which is supported by NIH Research Facility Improvement Grant 1G20RR030893-01, and associated funds from the New York State Empire State Development, Division of Science Technology and Innovation (NYSTAR) Contract C090171, both awarded April 15, 2010.
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 19 (8) Sequence Number: - Start / End Page: 4934 - 4940 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403