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  Moiré nematic phase in twisted double bilayer graphene

Rubio-Verdú, C., Turkel, S., Song, L., Klebl, L., Samajdar, R., Scheurer, M. S., et al. (2022). Moiré nematic phase in twisted double bilayer graphene. Nature Physics, 18(2), 196-202. doi:10.1038/s41567-021-01438-2.

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Supplementary Figs. 1–8 and Discussion. Source data for plots in Fig. 1c–e; 2c,d; 3c,d; 4e.
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 Creators:
Rubio-Verdú, C.1, Author
Turkel, S.1, Author
Song, L.1, Author
Klebl, L.2, Author
Samajdar, R.3, Author
Scheurer, M. S.3, 4, Author
Venderbos, J. W. F.5, 6, Author
Watanabe, K.7, Author
Taniguchi, T.8, Author
Ochoa, H.1, Author
Xian, L. D.9, 10, 11, Author           
Kennes, D. M.2, 9, 10, Author           
Fernandes, R. M.12, Author
Rubio, A.9, 10, 13, 14, Author           
Pasupathy, A. N.1, Author
Affiliations:
1Department of Physics, Columbia University, New York, ou_persistent22              
2Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
3Department of Physics, Harvard University, Cambridge, ou_persistent22              
4Institute for Theoretical Physics, University of Innsbruck, ou_persistent22              
5Department of Physics, Drexel University, Philadelphia, ou_persistent22              
6Department of Materials Science and Engineering, Drexel University, Philadelphia, ou_persistent22              
7Research Center for Functional Materials, National Institute for Materials Science, ou_persistent22              
8International Center for Materials Nanoarchitectonics, National Institute for Materials Science, ou_persistent22              
9Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
10Center for Free Electron Laser Science, ou_persistent22              
11Songshan Lake Materials Laboratory, Guangdong, ou_persistent22              
12School of Physics and Astronomy, University of Minnesota, Minneapolis, ou_persistent22              
13Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
14Nano-Bio Spectroscopy Group, Departamento de Físicade Materiales, UPV/EHU, ou_persistent22              

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 Abstract: Graphene moiré superlattices display electronic flat bands. At integer fillings of these flat bands, energy gaps due to strong electron–electron interactions are generally observed. However, the presence of other correlation-driven phases in twisted graphitic systems at non-integer fillings is unclear. Here, we report the existence of three-fold rotational (C3) symmetry breaking in twisted double bilayer graphene. Using spectroscopic imaging over large and uniform areas to characterize the direction and degree of C3 symmetry breaking, we find it to be prominent only at energies corresponding to the flat bands and nearly absent in the remote bands. We demonstrate that the magnitude of the rotational symmetry breaking does not depend on the degree of the heterostrain or the displacement field, being instead a manifestation of an interaction-driven electronic nematic phase. We show that the nematic phase is a primary order that arises from the normal metal state over a wide range of doping away from charge neutrality. Our modelling suggests that the nematic instability is not associated with the local scale of the graphene lattice, but is an emergent phenomenon at the scale of the moiré lattice.

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Language(s): eng - English
 Dates: 2021-03-192021-10-262021-12-232022-02-01
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2009.11645
DOI: 10.1038/s41567-021-01438-2
 Degree: -

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Project name : -
Grant ID : 844271
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : L.K., D.M.K. and A.R. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) under Germany’s Excellence Strategy-Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1-390534769 and Advanced Imaging of Matter (AIM) EXC 2056−390715994 and funding by the Deutsche Forschungsgemeinschaft (DFG) under RTG 1995, within the Priority Program SPP 2244 ‘2DMP’ and GRK 2247.
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Source 1

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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 18 (2) Sequence Number: - Start / End Page: 196 - 202 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850