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Observation of spatially-varying Fermi velocity in strained-graphene directly grown on hexagonal boron nitride

Authors
Jang, Won-JunKim, HowonShin, Yong-RoWang, MinJang, Sung KyuKim, MinwooLee, SungjooKim, Sang-WooSong, Young JaeKahng, Se-Jong
Issue Date
8월-2014
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CARBON, v.74, pp.139 - 145
Indexed
SCIE
SCOPUS
Journal Title
CARBON
Volume
74
Start Page
139
End Page
145
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/97867
DOI
10.1016/j.carbon.2014.03.015
ISSN
0008-6223
Abstract
Electronic properties of graphene can be controlled by using elastic strain. Theories predicted two major effects of strain, pseudo-magnetic field and spatially-varying Fermi velocity effects in graphene, but only the former was confirmed by experiments. Here, we report the experimental evidences of the latter, observed in strained graphene weakly coupled to a hexagonal boron nitride (BN) using scanning tunneling microscopy (STM) and spectroscopy (STS). V-shaped STS spectra showed spatially-varying slopes at lines across the strained ridges, whereas they showed constant slopes at lines along the long directions of ridges. The observed slope variations in the former were explained with the reduced Fermi velocity which is linear with the uniaxial strain less than 5% in agreement with theoretical predictions. Spatially-varying Fermi velocity that is controllable by local strain can provide an accessible component for the electronic engineering of graphene. (C) 2014 Elsevier Ltd. All rights reserved.
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