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  Direct Observation of Incommensurate–Commensurate Transition in Graphene-hBN Heterostructures via Optical Second Harmonic Generation

Stepanov, E. A., Semin, S. V., Woods, C. R., Vandelli, M., Kimel, A. V., Novoselov, K. S., et al. (2020). Direct Observation of Incommensurate–Commensurate Transition in Graphene-hBN Heterostructures via Optical Second Harmonic Generation. ACS Applied Materials and Interfaces, 12(24), 27758-27764. doi:10.1021/acsami.0c05965.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-B30C-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-B30D-2
Genre: Journal Article

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https://dx.doi.org/10.1021/acsami.0c05965 (Publisher version)
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 Creators:
Stepanov, E. A.1, 2, Author
Semin, S. V.3, Author
Woods, C. R.4, Author
Vandelli, M.1, 5, 6, 7, Author              
Kimel, A. V.3, Author
Novoselov, K. S.4, 8, Author
Katsnelson, M. I.2, 3, Author
Affiliations:
1Institute of Theoretical Physics, Department of Physics, University of Hamburg, ou_persistent22              
2Theoretical Physics and Applied Mathematics Department, Ural Federal University, ou_persistent22              
3Institute for Molecules and Materials, Radboud University, ou_persistent22              
4School of Physics and Astronomy and National Graphene Institute, University of Manchester, ou_persistent22              
5The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
6Center for Free Electron Laser Science, ou_persistent22              
7Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
8Chongqing 2D Materials Institute, ou_persistent22              

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 Abstract: Commensurability effects play a crucial role in the formation of electronic properties of novel layered heterostructures. The interest in these moiré superstructures has increased tremendously since the recent observation of a superconducting state (Nature 2018, 556, 43–50) and metal–insulator transition (Nature 2018, 556, 80–84) in twisted bilayer graphene. In this regard, a straightforward and efficient experimental technique for detection of the alignment of layered materials is desired. In this work, we use optical second harmonic generation, which is sensitive to the inversion symmetry breaking, to investigate the alignment of graphene/hexagonal boron nitride heterostructures. To achieve that, we activate a commensurate–incommensurate phase transition by a thermal annealing of the sample. We find that this structural change in the system can be directly observed via a strong modification of a nonlinear optical signal. Unambiguous interpretation of obtained results reveals the potential of a second harmonic generation technique for probing of structural changes in layered systems.

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Language(s): eng - English
 Dates: 2020-03-312020-05-222020-05-222020-06-17
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsami.0c05965
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Other : ACS Applied Materials & Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 12 (24) Sequence Number: - Start / End Page: 27758 - 27764 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244