Universität zu Köln

Rakic, Iva Srut, Kralj, Marko ORCID: 0000-0002-9786-3130, Jolie, Wouter, Lazic, Predrag, Sun, Wenhao, Avila, Jose, Asensio, Maria-Carmen, Craes, Fabian, Trontl, Vesna Miksic, Busse, Carsten ORCID: 0000-0001-5522-0578 and Pervan, Petar ORCID: 0000-0002-0273-2737 (2016). Step-induced faceting and related electronic effects for graphene on Ir(332). Carbon, 110. S. 267 - 278. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-3891

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Abstract

Modifications of graphene's electronic band structure can be achieved through periodic bending strain and related potential in samples grown on stepped substrates, opening a viable route to implement the periodicity effects in this ultimate two-dimensional (2D) material. We studied graphene grown on stepped Ir(332), which can be benchmarked to a well-known graphene on flat Ir(111) recognized for a weak van der.Waals (vdW) interaction. The structural characterization indicated that graphene growth induces reversible, well defined faceting of iridium surface into alternating terraces and step bunches, while spectroscopy techniques revealed substantial changes of graphene's electronic structure. Crucially, highly concentrated Ir step edges, resulting in locally strong chemical bonding of graphene, introduce a dominant energy parameter which overwhelms the induced strain and presents a driving force for the surface faceting. This sets a general framework for the understanding of graphene mediated faceting of stepped substrates whenever the corresponding low index surface exhibits dominantly vdW interaction with graphene, which can be also supplemented to other 2D materials. Interestingly, the graphene band becomes pronouncedly anisotropic due to the presence of a periodic potential originating from steps, and lateral variation of the charge carrier concentration enabling a straightforward electronic band engineering in graphene. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rakic, Iva Srut UNSPECIFIED UNSPECIFIED UNSPECIFIED Kralj, Marko UNSPECIFIED orcid.org/0000-0002-9786-3130 UNSPECIFIED Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Lazic, Predrag UNSPECIFIED UNSPECIFIED UNSPECIFIED Sun, Wenhao UNSPECIFIED UNSPECIFIED UNSPECIFIED Avila, Jose UNSPECIFIED UNSPECIFIED UNSPECIFIED Asensio, Maria-Carmen UNSPECIFIED UNSPECIFIED UNSPECIFIED Craes, Fabian UNSPECIFIED UNSPECIFIED UNSPECIFIED Trontl, Vesna Miksic UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED Pervan, Petar UNSPECIFIED orcid.org/0000-0002-0273-2737 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-254682
DOI:	10.1016/j.carbon.2016.09.024
Journal or Publication Title:	Carbon
Volume:	110
Page Range:	S. 267 - 278
Date:	2016
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-3891
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LARGE-AREA SYNTHESIS; HIGH-QUALITY; GROWTH; SURFACES; DYNAMICS; LATTICE; MOS2; CU Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25468