Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.7: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Mechanical characterization of single electron charging in a quantum dot in the Kondo regime — •Daniel Schmid, Alois Dirnaichner, Peter Stiller, Christoph Strunk, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

Detection of the transversal mechanical resonance frequency of a suspended, doubly clamped carbon nanotube resonator can be used to infer changes in the time-averaged charge on the embedded quantum dot at cryogenic temperatures. This method is applied to the case of strong Kondo correlations between the quantum dot and its leads; we observe and model single electron charging as function of the applied gate voltage in a highly regular transport spectrum. Good agreement with theoretical predictions and previous observations in literature in GaAs is observed.