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Mobilities and scattering times in decoupled graphene monolayers

H. Schmidt, T. Lüdtke, P. Barthold, and R. J. Haug
Phys. Rev. B 81, 121403(R) – Published 2 March 2010

Abstract

Folded single-layer graphene forms a system of two decoupled monolayers being only a few angstroms apart. Using magnetotransport measurements we investigate the electronic properties of the two layers conducting in parallel. We show a method to obtain the mobilities for the individual layers despite them being jointly contacted. The mobilities in the upper layer are significantly larger than in the bottom one indicating weaker substrate influence. This is confirmed by larger transport and quantum scattering times in the top layer. Analyzing the temperature dependence of the Shubnikov-de Haas oscillations, effective masses and corresponding Fermi velocities are obtained yielding reduced values down to 66% in comparison to monolayers.

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  • Received 9 February 2010

DOI:https://doi.org/10.1103/PhysRevB.81.121403

©2010 American Physical Society

Authors & Affiliations

H. Schmidt, T. Lüdtke, P. Barthold, and R. J. Haug

  • Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

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Issue

Vol. 81, Iss. 12 — 15 March 2010

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