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  Unconventional non-local relaxation dynamics in a twisted trilayer graphene moiré superlattice

Halbertal, D., Turkel, S., Ciccarino, C. J., Hauck, J., Finney, N., Hsieh, V., et al. (2022). Unconventional non-local relaxation dynamics in a twisted trilayer graphene moiré superlattice. Nature Communications, 13(1): 7587. doi:10.1038/s41467-022-35213-5.

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 Creators:
Halbertal, D.1, Author
Turkel, S.1, 2, Author
Ciccarino, C. J.3, Author
Hauck, J.4, Author
Finney, N.1, Author
Hsieh, V.1, Author
Watanabe, K.5, Author
Taniguchi, T.6, Author
Hone, J.1, Author
Dean, C.1, Author
Narang, Prineha3, Author
Pasupathy, A. N.1, 2, Author
Kennes, D. M.4, 7, 8, Author           
Basov, D. N.1, Author
Affiliations:
1Department of Physics, Columbia University, ou_persistent22              
2Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, ou_persistent22              
3Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, ou_persistent22              
4Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
5Research Center for Functional Materials, National Institute for Materials Science, ou_persistent22              
6International Center for Materials Nanoarchitectonics, National Institute for Materials Science, ou_persistent22              
7Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
8Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: The electronic and structural properties of atomically thin materials can be controllably tuned by assembling them with an interlayer twist. During this process, constituent layers spontaneously rearrange themselves in search of a lowest energy configuration. Such relaxation phenomena can lead to unexpected and novel material properties. Here, we study twisted double trilayer graphene (TDTG) using nano-optical and tunneling spectroscopy tools. We reveal a surprising optical and electronic contrast, as well as a stacking energy imbalance emerging between the moiré domains. We attribute this contrast to an unconventional form of lattice relaxation in which an entire graphene layer spontaneously shifts position during assembly, resulting in domains of ABABAB and BCBACA stacking. We analyze the energetics of this transition and demonstrate that it is the result of a non-local relaxation process, in which an energy gain in one domain of the moiré lattice is paid for by a relaxation that occurs in the other.

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Language(s): eng - English
 Dates: 2022-07-292022-11-182022-12-08
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2208.10399
DOI: 10.1038/s41467-022-35213-5
 Degree: -

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Project name : Nano-imaging research at Columbia is supported by DOE-BES grant DE-SC0018426. STM measurements were supported by the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy (DOE) under Contract No. DE-SC0012704. ANP acknowledges salary support from the National Science Foundation via grant DMR-2004691. The development of nano-optical methods is supported as part of Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award DE-SC0019443. Research on atomic relaxation is supported by W911NF2120147. Work by C.J.C. and P.N. was primarily supported by the Department of Energy, Photonics at Thermodynamic Limits Energy Frontier Research Center, under Grant No. DE-SC0019140. We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under RTG 1995 and RTG 2247, within the Priority Program SPP 2244 “2DMP”, under Germany’s Excellence Strategy - Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1 - 390534769 and - Cluster of Excellence and Advanced Imaging of Matter (AIM) EXC 2056 - 390715994. We acknowledge computational resources provided by the Max Planck Computing and Data Facility and RWTH Aachen University under project number rwth0811. This work was supported by the Max Planck-New York City Center for Nonequilibrium Quantum Phenomena. P.N. acknowledges support as a Moore Inventor Fellow through Grant No. GBMF8048 and gratefully acknowledges support from the Gordon and Betty Moore Foundation. D.N.B. is Moore Investigator in Quantum Materials EPIQS GBMF9455. D.H. was supported by a grant from the Simons Foundation (579913).
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 13 (1) Sequence Number: 7587 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723