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Localisation and finite-size effects in graphene flakes

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González-Santander, C. and Domínguez-Adame Acosta, Francisco and Hilke, M. and Roemer, R. A. (2013) Localisation and finite-size effects in graphene flakes. EPL, 1047 (1). ISSN 0295-5075

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Official URL: http://dx.doi.org/10.1209/0295-5075/104/17012




Abstract

We show that electron states in disordered graphene, with an onsite potential that induces inter-valley scattering, are localised for all energies at disorder as small as 1/6 of the band width of clean graphene. We clarify that, in order for this Anderson-type localisation to be manifested, graphene flakes of size approximate to 200 x 200 nm(2) or larger are needed. For smaller samples, due to the surprisingly large extent of the electronic wave functions, a regime of apparently extended (or even critical) states is identified. Our results complement earlier studies of macroscopically large samples and can explain the divergence of results for finite-size graphene flakes.


Item Type:Article
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© EPLA, 2013.
CGS and RAR are grateful to the CSC and UCM for hospitality, respectively, and to Ministerio de Educación, Comunidad de Madrid and the European Social Fund for funding the research stays at Madrid and Warwick during which much of this work was done. Work at Madrid was supported by MICINN (project MAT2010-17180). Caculations were done at i) CSC Warwick (MidPlus, EP SRC EP/K000128/1), ii) cluster for physics (UCM, Feder FUNDS and CEI Moncloa) and iii) Centro Nacional de Supercomputaci´on - Barcelona Supercomputing Center.

Uncontrolled Keywords:Metal-Insulator-Transition, Anderson Transition, Disordered-Systems, Coherent Transport, Electronic States, Scaling Theory, Absence, Dependence, Diffusion, Length
Subjects:Sciences > Physics > Materials
ID Code:27395
Deposited On:21 Nov 2014 13:03
Last Modified:13 May 2016 17:00

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