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  Universal moiré nematic phase in twisted graphitic systems

Rubio-Verdú, C., Turkel, S., Song, L., Klebl, L., Samajdar, R., Scheurer, M. S., et al. (2020). Universal moiré nematic phase in twisted graphitic systems.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-1CA9-C Version Permalink: http://hdl.handle.net/21.11116/0000-0007-1CAA-B
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2009.11645.pdf (Preprint), 3MB
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https://arxiv.org/abs/2009.11645 (Preprint)
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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, Author              
Kennes, D. M.2, 9, 10, Author              
Fernandes, R. M.11, Author
Rubio, A.9, 10, 12, 13, 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              
11School of Physics and Astronomy, University of Minnesota, Minneapolis, ou_persistent22              
12Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
13Nano-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 scanning tunneling microscopy (STM) measurements that reveal the existence of threefold rotational (C3) symmetry breaking in twisted double bilayer graphene (tDBG). 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 C3 symmetry breaking cannot be explained by heterostrain or the displacement field, and is instead a manifestation of an interaction-driven electronic nematic phase, which emerges even away from integer fillings. Comparing our experimental data with a combination of microscopic and phenomenological modeling, we show 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, pointing to the universal character of this ordered state in flat band moiré materials.

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Language(s): eng - English
 Dates: 2020-09-24
 Publication Status: Published online
 Pages: 23
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2009.11645
 Degree: -

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