Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.35: Poster

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

Induced thermal gradient and quantum shot noise cross-talk in neighboring nanodevices — •Johannes Buelte¹, Federica Haupt², and Wolfgang Belzig¹ — ¹Fachbereich Physik, Universität Konstanz, D-78457, Germany — ²Institut für Theoretische Physik A, RWTH Aachen, D-52074 Aachen, Germany

Motivated by recent experimental results showing strong modifications of the current through a carbon nanotube quantum dot (QD) due to the bias voltage applied to a close-by graphene constriction, we investigate theoretically the cross-talk between neighboring nanodevices. We first show that several of the observed features can be understood assuming that a temperature gradient across the QD develops as the bias applied to the graphene constriction is increased. Next, we consider a model where the biased graphene constriction is treated as non-equilibrium electromagnetic environment for the quantum dot, and use such a model to a) draw a clear connection between the voltage applied to the former and the effective temperature gradient across the QD; b) investigate the dependence of the current in the QD on the spectral properties of the electromagnetic environment itself.