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Superlattice in collapsed graphene wrinkles

Topographic corrugations, such as wrinkles, are known to introduce diverse physical phenomena that can significantly modify the electrical, optical and chemical properties of two-dimensional materials. This range of assets can be expanded even further when the crystal lattices of the walls of the wr...

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Autores principales: Verhagen, Tim, Pacakova, Barbara, Bousa, Milan, Hübner, Uwe, Kalbac, Martin, Vejpravova, Jana, Frank, Otakar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6620273/
https://www.ncbi.nlm.nih.gov/pubmed/31292481
http://dx.doi.org/10.1038/s41598-019-46372-9
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author Verhagen, Tim
Pacakova, Barbara
Bousa, Milan
Hübner, Uwe
Kalbac, Martin
Vejpravova, Jana
Frank, Otakar
author_facet Verhagen, Tim
Pacakova, Barbara
Bousa, Milan
Hübner, Uwe
Kalbac, Martin
Vejpravova, Jana
Frank, Otakar
author_sort Verhagen, Tim
collection PubMed
description Topographic corrugations, such as wrinkles, are known to introduce diverse physical phenomena that can significantly modify the electrical, optical and chemical properties of two-dimensional materials. This range of assets can be expanded even further when the crystal lattices of the walls of the wrinkle are aligned and form a superlattice, thereby creating a high aspect ratio analogue of a twisted bilayer or multilayer – the so-called twisted wrinkle. Here we present an experimental proof that such twisted wrinkles exist in graphene monolayers on the scale of several micrometres. Combining atomic force microscopy and Raman spectral mapping using a wide range of visible excitation energies, we show that the wrinkles are extremely narrow and their Raman spectra exhibit all the characteristic features of twisted bilayer or multilayer graphene. In light of a recent breakthrough – the superconductivity of a magic-angle graphene bilayer, the collapsed wrinkles represent naturally occurring systems with tuneable collective regimes.
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spelling pubmed-66202732019-07-18 Superlattice in collapsed graphene wrinkles Verhagen, Tim Pacakova, Barbara Bousa, Milan Hübner, Uwe Kalbac, Martin Vejpravova, Jana Frank, Otakar Sci Rep Article Topographic corrugations, such as wrinkles, are known to introduce diverse physical phenomena that can significantly modify the electrical, optical and chemical properties of two-dimensional materials. This range of assets can be expanded even further when the crystal lattices of the walls of the wrinkle are aligned and form a superlattice, thereby creating a high aspect ratio analogue of a twisted bilayer or multilayer – the so-called twisted wrinkle. Here we present an experimental proof that such twisted wrinkles exist in graphene monolayers on the scale of several micrometres. Combining atomic force microscopy and Raman spectral mapping using a wide range of visible excitation energies, we show that the wrinkles are extremely narrow and their Raman spectra exhibit all the characteristic features of twisted bilayer or multilayer graphene. In light of a recent breakthrough – the superconductivity of a magic-angle graphene bilayer, the collapsed wrinkles represent naturally occurring systems with tuneable collective regimes. Nature Publishing Group UK 2019-07-10 /pmc/articles/PMC6620273/ /pubmed/31292481 http://dx.doi.org/10.1038/s41598-019-46372-9 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Verhagen, Tim
Pacakova, Barbara
Bousa, Milan
Hübner, Uwe
Kalbac, Martin
Vejpravova, Jana
Frank, Otakar
Superlattice in collapsed graphene wrinkles
title Superlattice in collapsed graphene wrinkles
title_full Superlattice in collapsed graphene wrinkles
title_fullStr Superlattice in collapsed graphene wrinkles
title_full_unstemmed Superlattice in collapsed graphene wrinkles
title_short Superlattice in collapsed graphene wrinkles
title_sort superlattice in collapsed graphene wrinkles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6620273/
https://www.ncbi.nlm.nih.gov/pubmed/31292481
http://dx.doi.org/10.1038/s41598-019-46372-9
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