Nicholas Dale
;
M. Iqbal Bakti Utama
;
Dongkyu Lee
;
Nicolas Leconte
;
Sihan Zhao
;
Kyunghoon Lee
;
Takashi Taniguchi
(National Institute for Materials Science)
;
Kenji Watanabe
(National Institute for Materials Science)
;
Chris Jozwiak
;
Aaron Bostwick
;
Eli Rotenberg
;
Roland J. Koch
;
Jeil Jung
;
Feng Wang
;
Alessandra Lanzara
Collection
Citation
Description:
(abstract)Near the magic angle, strong correlations drive many intriguing phases in twisted bilayer graphene (tBG) including unconventional superconductivity and chern insulation. Whether correlations can tune symmetry-breaking phases in tBG at intermediate (>2º) twist angles remains an open fun- damental question. Here, using angle resolved photoemission spectroscopy, we study the effects of many-body interactions and displacement field on the band structure of bilayer graphene field-effect devices at intermediate (3º) twist angle. We observe a layer and doping-dependent renormalization of bands at the K points that is qualitatively consistent with moir ́e models of the Hartree-Fock interaction. We provide evidence for correlation-enhanced inversion symmetry breaking, manifested by gaps at the Dirac points which are tunable with doping. These results suggest that electronic interactions play a significant role in the physics of bilayer graphene even at intermediate twist angles, and present a new pathway towards engineering band structure and symmetry-breaking phases in moiré heterostructures.
Rights:
Keyword: Twisted bilayer graphene, symmetry breaking phases, ARPES
Date published: 2023-08-09
Publisher: American Chemical Society (ACS)
Journal:
- Nano Letters (ISSN: 15306984) vol. 23 issue. 15 p. 6799-6806
Funding:
- U.S. Department of Energy DE-AC02- 05CH11231
- U.S. Department of Energy DEAC02- 05CH11231
- Japan Society for the Promotion of Science 21H05233
- Gordon and Betty Moore Foundation GBMF4859
- Samsung Science and Technology Foundation SSTF-BA1802- 06
- National Research Foundation of Korea 2020R1A2C3009142
- National Research Foundation of Korea 2020R1A5A1016518
- Korea Institute of Science and Technology Information KSC-2022-CRE-0514
- Japan Society for the Promotion of Science 19H05790
- Japan Society for the Promotion of Science 20H00354
- Ministry of Land, Infrastructure and Transport
- Urban Big data and AI Institute
- Innovative Talent Education Program for Smart Cities
Manuscript type: Publisher's version (Version of record)
MDR DOI:
First published URL: https://doi.org/10.1021/acs.nanolett.3c00253
Related item:
Other identifier(s):
Contact agent:
Updated at: 2025-02-14 16:31:18 +0900
Published on MDR: 2025-02-14 16:31:19 +0900
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