Superlattice in collapsed graphene wrinkles

0506500 - ÚFCH JH 2020 RIV GB eng J - Journal Article
Verhagen, T. A. - Pacáková, B. - Bouša, Milan - Hübner, U. - Kalbáč, Martin - Vejpravová, J. - Frank, Otakar
Superlattice in collapsed graphene wrinkles.
Scientific Reports. Roč. 9, č. 1 (2019), č. článku 9972. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR(CZ) GA17-18702S
EU Projects: European Commission(XE) 716265
Institutional support: RVO:61388955
Keywords : resonant Raman spectroscopy * strain * bilayers
OECD category: Physical chemistry
Impact factor: 3.998, year: 2019
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0297732