Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 31: Poster II
HL 31.13: Poster
Dienstag, 26. Februar 2008, 16:30–19:00, Poster D
SAW-mediated single-electron transport through carbon nanotubes — •Markus Regler1,2, Jens Ebbecke1,2,3, and Achim Wixforth1,2 — 1Lehrstuhl für Experimentalphysik 1, Institut für Physik, Universität Augsburg, Universitätsstr.1, 86159 Augsburg — 2Center for Nanoscience, Geschwister-Scholl-Platz 1, 80539 München — 3School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
Carbon nanotubes (CNT) are ideal one-dimensional conductors. Depending on their chirality they behave metallic or semiconducting and with their size on the nanometer scale they are very promising candidates for future electronic devices.
Surface acoustic waves (SAW) are earthquake-like waves on a piezoelectric substrate and are therefore always accompanied by an electric field. This lateral, dynamically induced potential can be used to manipulate charges as well as potential landscapes.
SAW and CNT combined provide novel prospects for future devices. For instance quantum dots can be created in a CNT just by contacting it with metal electrodes or by biasing gate electrodes on top of the CNT. The confining barriers of such quantum dot are manipulated by a properly designed SAW. The entrance and exit barriers are alternately modulatied and an electron can pass the lowered barrier easily. The resulting, SAW-driven few electron current turns out to be given by I=e*f with e: elementary charge and f: SAW-frequency. At high frequencies, it may reach nanoamperes. A current standard would be a possible application for these turnstile devices.