Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.30: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Localisation and finite-size effects in graphene flakes — Clara González-Santander1, Francisco Domínguez-Adame1, •Michael Hilke2, and Rudolf A. Römer3 — 1GISC, Departamento de Física de Materiales, Universidad Complutense - E-28040 Madrid, Spain — 2Department of Physics, McGill University, Montréal (Québec) - H3A 2T8, Canada — 3Department of Physics and Centre for Scientific Computing, University of Warwick - Coventry, CV4 7AL, UK
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 ≈ 200 × 200 nm2 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.