Low-energy electron reflectivity from graphene

Low-energy reflectivity of electrons from single- and multilayer graphene is examined both theoretically and experimentally. A series of minima in the reflectivity over the energy range of 0-8 eV are found, with the number of minima depending on the number of graphene layers. Using first-principles...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-01, Vol.87 (4), Article 041406
Main Authors: Feenstra, R. M., Srivastava, N., Gao, Qin, Widom, M., Diaconescu, Bogdan, Ohta, Taisuke, Kellogg, G. L., Robinson, J. T., Vlassiouk, I. V.
Format: Article
Language:English
Subjects:
Bonding
Condensed matter
Graphene
Low energy
Minima
Multilayers
Reflectivity
Slabs
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Summary:Low-energy reflectivity of electrons from single- and multilayer graphene is examined both theoretically and experimentally. A series of minima in the reflectivity over the energy range of 0-8 eV are found, with the number of minima depending on the number of graphene layers. Using first-principles computations, it is demonstrated that a freestanding n-layer graphene slab produces n - 1 reflectivity minima. This same result is also found experimentally for graphene supported on SiO sub(2). For graphene bonded onto other substrates it is argued that a similar series of reflectivity minima is expected, although in certain cases an additional minimum occurs, at an energy that depends on the graphene-substrate separation and the effective potential in that space.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.041406