Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session A21: Focus Session: Graphene: Quantum Interference and Transport
8:00 AM–11:00 AM,
Monday, March 15, 2010
Room: Portland Ballroom 251
Sponsoring Unit: DCMP
Chair: Steve Cronin, University of Southern California
Abstract ID: BAPS.2010.MAR.A21.2
Abstract: A21.00002 : Simulating a movable scatterer in coherent graphene devices*
8:12 AM–8:24 AM
Preview Abstract Abstract
We study coherent transport of electrons through a graphene device. At sufficiently low temperatures in mesoscopic samples, this diffusive transport becomes coherent. Thus, small changes in the device, such as modifying the chemical potential or changing the location of impurities, induces electrical conductance fluctuations. The magnitude of these fluctuations has a universal value (of order $e^2/h$) independent of the quality of the sample and at low temperatures of its size. A recent experiment by Berezovsky et al, employed a liquid-He-cooled scanning probe microscope (SPM) tip to induce a movable scatterer in a graphene device. The experiment found that a small change to the disorder configuration can drastically change the electrical conductance. We present numerical calculations of transport in realistic grapehene devices studied with the SPM technique. We find good agreement with experimental results and report the effects of varying the details of the disorder.
*We acknoledge support from the DOE.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.A21.2
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