Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.11: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Quantum dots in ultra-clean, suspended single-wall carbon nanotubes — •Peter Stiller, Daniel Schmid, Sabine Kugler, Alois Dirnaichner, Christoph Strunk, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

Single suspended carbon nanotubes, CVD-grown over pre-defined contacts without any further chemical or lithographic processing, can exhibit their unperturbed electronic level structure in transport spectroscopy. We present measurements on the quantum dot forming in such a nanotube in the few carrier limit, characterizing the electronic and mechanical properties and the interaction of both. The measurements show the transition from strong Coulomb blockade to the Kondo regime on the electron conduction side and from Coulomb blockade to Fabry-Perot interference on the hole conduction side. On the electronic side the few carrier spectrum is characterized in detail, as well as the build-up of Kondo correlations towards higher electron numbers.