Disorder induced Coulomb gaps in graphene constrictions with different  aspect ratios

Terres, B.; Stampfer, C.; Dauber, J.; Volk, C.; Wichmann, U.; Trellenkamp, S.

doi:10.1063/1.3544580

Journal Article

PreJuSER-19843

Disorder induced Coulomb gaps in graphene constrictions with different aspect ratios

Terres, B.FZJ* ; Dauber, J.FZJ* ; Volk, C.FZJ* ; Trellenkamp, S.FZJ* ; Wichmann, U.FZJ* ; Stampfer, C.FZJ*

2011
American Institute of Physics Melville, NY

Applied physics letters 98, 032109 (2011) [10.1063/1.3544580]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7406 doi:10.1063/1.3544580

Abstract: We present electron transport measurements on lithographically defined and etched graphene nanoconstrictions with different aspect ratios including different lengths (l) and widths (w). A roughly length-independent disorder induced effective energy gap can be observed around the charge neutrality point. This energy gap scales inversely with the width even in regimes where the length of the constriction is smaller than its width (l<w). In very short constrictions, we observe both resonances due to localized states or charged islands and an elevated overall conductance level (0.1-1e(2)/h), which is strongly length-dependent in the gap region. This makes very short graphene constrictions interesting for highly transparent graphene tunneling barriers. (c) 2011 American Institute of Physics. [doi:10.1063/1.3544580]

Keyword(s): J

Classification:

Physics, Applied

Note: The authors wish to thank C. Barengo, P. Studerus, M. Morgenstern, D. Grutzmacher, P. Kordt, J. Schirra, and S. Gustavsson for their support and help in setting up our new laboratory. We thank A. Steffen, R. Lehmann, and J. Mohr for the help on the sample fabrication. Discussion with H. Luth, T. Heinzel, T. Ihn, and J. Guttinger and support by the JARA Seed Fund and SPP-1459 are gratefully acknowledged.

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