Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101509
Title: Direct Observation of Incommensurate-Commensurate Transition in Graphene-hBN Heterostructures via Optical Second Harmonic Generation
Authors: Stepanov, E. A.
Stepanov, E. A.
Semin, S. V.
Woods, C. R.
Woods, C. R.
Vandelli, M.
Vandelli, M.
Vandelli, M.
Kimel, A. V.
Novoselov, K. S.
Novoselov, K. S.
Novoselov, K. S.
Katsnelson, M. I.
Katsnelson, M. I.
Issue Date: 2020
Publisher: American Chemical Society
Citation: Direct Observation of Incommensurate-Commensurate Transition in Graphene-hBN Heterostructures via Optical Second Harmonic Generation / E. A. Stepanov, E. A. Stepanov, S. V. Semin, et al. — DOI 10.1021/acsami.0c05965 // ACS Applied Materials and Interfaces. — 2020. — Vol. 12. — Iss. 24. — P. 27758-27764.
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. Copyright © 2020 American Chemical Society.
Keywords: ALIGNMENT
COMMENSURABILITY
GRAPHENE
HETEROSTRUCTURES
HEXAGONAL BORON NITRIDE
NONLINEAR OPTICS
OPTICAL SECOND HARMONIC GENERATION
ELECTRONIC PROPERTIES
GRAPHENE
HARMONIC ANALYSIS
HARMONIC GENERATION
III-V SEMICONDUCTORS
METAL INSULATOR BOUNDARIES
NONLINEAR OPTICS
SEMICONDUCTOR INSULATOR BOUNDARIES
DIRECT OBSERVATIONS
EXPERIMENTAL TECHNIQUES
INCOMMENSURATE PHASE
INVERSION SYMMETRY
NONLINEAR OPTICAL SIGNALS
OPTICAL SECOND HARMONIC GENERATION
SUPERCONDUCTING STATE
THERMAL-ANNEALING
METAL INSULATOR TRANSITION
URI: http://hdl.handle.net/10995/101509
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85086682100
PURE ID: 13145286
8112cb89-7776-4284-a62d-65b7379ff7fd
ISSN: 19448244
DOI: 10.1021/acsami.0c05965
metadata.dc.description.sponsorship: The authors thank Chris Berkhout for technical support in nonlinear measurements. The authors also thank Clement Dutreix and Vladimir Kukushkin for fruitful discussions and useful comments. The work of E.A.S. was supported by the Russian Science Foundation, Grant 17-72-20041. K.S.N. acknowledges support from EU Graphene Flagship Program (Contract CNECTICT-604391), European Research Council Synergy Grant Hetero2D, the Royal Society, EPSRC Grant EP/N010345/1. The work of M.I.K. was supported by European Research Council via Synergy Grant 854843 - FASTCORR.
RSCF project card: 17-72-20041
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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