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  Correlated electronic phases in twisted bilayer transition metal dichalcogenides

Wang, L., Shih, E.-M., Ghiotto, A., Xian, L. D., Rhodes, D. A., Tan, C., et al. (2020). Correlated electronic phases in twisted bilayer transition metal dichalcogenides. Nature Materials, 19(8), 861-866. doi:10.1038/s41563-020-0708-6.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-440B-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C707-2
Genre: Journal Article

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https://arxiv.org/abs/1910.12147 (Preprint)
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https://dx.doi.org/10.1038/s41563-020-0733-5 (Supplementary material)
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 Creators:
Wang, L.1, 2, Author
Shih, E.-M.2, Author
Ghiotto, A.2, Author
Xian, L. D.3, Author              
Rhodes, D. A.4, Author
Tan, C.4, 5, Author
Claassen, M.6, Author
Kennes, D. M.3, 7, Author
Bai, Y.8, Author
Kim, B.4, Author
Watanabe, K.9, Author
Taniguchi, T.9, Author
Zhu, X.8, Author
Hone, J.4, Author
Rubio, A.3, 6, 10, Author              
Pasupathy, A.2, Author
Dean, C. R.2, Author
Affiliations:
1National Laboratory of Solid-State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, ou_persistent22              
2Department of Physics, Columbia University, New York, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Department of Mechanical Engineering, Columbia University, ou_persistent22              
5Department of Electrical Engineering, Columbia University, ou_persistent22              
6Center for Computational Quantum Physics, Flatiron Institute, ou_persistent22              
7Institut für Theorie der Statistischen Physik, RWTH Aachen University 52056 Aachen, Germany and JARA-Fundamentals of Future Information Technology, ou_persistent22              
8Department of Chemistry, Columbia University, New York, ou_persistent22              
9National Institute for Materials Science, Tsukuba, ou_persistent22              
10Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del País Vasco, ou_persistent22              

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 Abstract: In narrow electron bands in which the Coulomb interaction energy becomes comparable to the bandwidth, interactions can drive new quantum phases. Such flat bands in twisted graphene-based systems result in correlated insulator, superconducting and topological states. Here we report evidence of low-energy flat bands in twisted bilayer WSe2, with signatures of collective phases observed over twist angles that range from 4 to 5.1°. At half-band filling, a correlated insulator appeared that is tunable with both twist angle and displacement field. At a 5.1° twist, zero-resistance pockets were observed on doping away from half filling at temperatures below 3 K, which indicates a possible transition to a superconducting state. The observation of tunable collective phases in a simple band, which hosts only two holes per unit cell at full filling, establishes twisted bilayer transition metal dichalcogenides as an ideal platform to study correlated physics in two dimensions on a triangular lattice.

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Language(s): eng - English
 Dates: 2019-12-222020-05-112020-06-222020-08-01
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1910.12147
DOI: 10.1038/s41563-020-0708-6
 Degree: -

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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 19 (8) Sequence Number: - Start / End Page: 861 - 866 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000