Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Transport: Graphene and Carbon Nanotubes
TT 21.4: Vortrag
Dienstag, 26. Februar 2008, 16:30–16:45, EB 202
Quantum transport in graphene-based nanosystems — •Jürgen Wurm1,2, Michael Wimmer1, Inanc Adagideli1, Harold Baranger2, and Klaus Richter1 — 1Institut für theoretische Physik, Universität Regensburg, 93040 Regensburg — 2Department of Physics, Duke University, Durham, NC 27708, USA
We numerically investigate the ballistic transport properties of graphene rings and other graphene-based nanostructures using a recursive Green function algorithm to calculate the conductance. Recently, the first transport experiments in ring systems made of graphene have been reported, and Aharonov-Bohm oscillations in the conductance were observed [1]. While our simulations confirm the Aharonov-Bohm oscillations in rings, as well as other quantum interference phenomena such as weak localization and universal conductance fluctuations in chaotic cavities, we also find effects of conductance suppression that are not present in usual two-dimensional electron gases.
[1] S. Russo, J.B. Oostinga, D. Wehenkel, H.B. Heersche, S.S. Sobhani, L.M.K. Vandersypen, A.F. Morpurgo, cond-mat 0711.1508 (2007)