Universität zu Köln

Simon, Sabina, Voloshina, Elena ORCID: 0000-0002-1799-1125, Tesch, Julia, Foerschner, Felix, Enenkel, Vivien, Herbig, Charlotte, Knispel, Timo, Tries, Alexander, Kroeger, Joerg, Dedkov, Yuriy ORCID: 0000-0001-7904-2892 and Fonin, Mikhail (2018). Layer-by-Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate. Small, 14 (13). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1613-6829

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Abstract

The electronic properties of graphene can be efficiently altered upon interaction with the underlying substrate resulting in a dramatic change of charge carrier behavior. Here, the evolution of the local electronic properties of epitaxial graphene on a metal upon the controlled formation of multilayers, which are produced by intercalation of atomic carbon in graphene/Ir(111), is investigated. Using scanning tunneling microscopy and Landau-level spectroscopy, it is shown that for a monolayer and bilayers with small-angle rotations, Landau levels are fully suppressed, indicating that the metal-graphene interaction is largely confined to the first graphene layer. Bilayers with large twist angles as well as twisted trilayers demonstrate a sequence of pronounced Landau levels characteristic for a free-standing graphene monolayer pointing toward an effective decoupling of the top layer from the metal substrate. These findings give evidence for the controlled preparation of epitaxial graphene multilayers with a different degree of decoupling, which represent an ideal platform for future electronic and spintronic applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Simon, Sabina UNSPECIFIED UNSPECIFIED UNSPECIFIED Voloshina, Elena UNSPECIFIED orcid.org/0000-0002-1799-1125 UNSPECIFIED Tesch, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerschner, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Enenkel, Vivien UNSPECIFIED UNSPECIFIED UNSPECIFIED Herbig, Charlotte UNSPECIFIED UNSPECIFIED UNSPECIFIED Knispel, Timo UNSPECIFIED UNSPECIFIED UNSPECIFIED Tries, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Kroeger, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Dedkov, Yuriy UNSPECIFIED orcid.org/0000-0001-7904-2892 UNSPECIFIED Fonin, Mikhail UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192414
DOI:	10.1002/smll.201703701
Journal or Publication Title:	Small
Volume:	14
Number:	13
Date:	2018
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1613-6829
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRONIC-STRUCTURE; MONOLAYER GRAPHENE; DIRAC-FERMIONS; MOIRE; INTERCALATION; INTERFACES; RU(0001); STATES; SCALE; FILMS Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19241