Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 23: Quantum Chaos I
DY 23.1: Vortrag
Donnerstag, 29. März 2012, 09:30–09:45, MA 001
New Scattering Mechanism in Rough Boundary Nanowires — •Otto Dietz1,2, Ulrich Kuhl1, Hans-Jürgen Stöckmann1,3, Nykolay M Makarov4, and Felix M Izrailev4 — 1FB Physik, Uni Marburg, Germany — 2Institute of Physics, Humboldt-Universität zu Berlin, Germany — 3LPMC, Université de Nice Sophia-Antipolis, France — 4Universidad Autónoma de Puebla, Mexico
Rough boundaries strongly influence the conductance of nanowires. The theoretical description of this influence constitutes an open problem across different fields, from silicon nanowires to graphene nanoribbons.
A recently proposed theory tackles this problem, but is restricted to ensembles of nanowires [1]. To overcome this restriction, we show experimentally that this theory is directly applicable to single nanowires. Now the conductance of a single wire can be calculated analytically from its boundary profile, and vice versa.
This is the first experimental test of the theory. We confirm the surprising prediction of a new scattering mechanism in nanowires. The theory is tested in microwave waveguides with rough walls. Because of the strict analogy between the 2d Schrödinger equation and the Helmholtz equation, the results can be directly applied to electron transport. The advantage of microwave techniques is that - in contrast to real nanowires - the boundary roughness is both known and controllable.
[1] M. Rendón et. al. Phys. Rev. B 75, 205404 (2007)