Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 72: Quantum dots: Transport properties

HL 72.5: Vortrag

Mittwoch, 2. April 2014, 16:00–16:15, POT 251

Temperature Driven Current Modulation in a Capacitively Coupled Double Quantum Dot — •Holger Thierschmann1, Marcel Mittermüller1, Luis Maier1, Wolfgang Hansen2, Hartmut Buhmann1, and Laurens W. Molenkamp11Physikalisches Institut (EP3), Universität Würzburg, Germany — 2Insitut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany

In recent years multi-terminal devices with interacting quantum dots (QD) have received an increasing attention. Especially subjected to a temperature difference such systems are expected to exhibit interesting effects, e.g. efficiently converting heat into a directed current [1]. Here we present measurements on a QD system consisting of two capacitively coupled dots. One of the QDs (QD1) can exchange energy and particles with a heat reservoir at a temperature T1 while the other (QD2) couples to two electron reservoirs at a lower temperature T2. In the vicinity of the triple points of the charge stability diagram we observe a strong dependence of the current through QD2 on the temperature of the heat reservoir T1. The sign of the current change is determined by the relative position of the dots' chemical potentials with respect to the reservoirs. I(QD2) can be related to the heat induced charge fluctuations.

[1] R. Sánchez and M. Büttiker, Phys. Rev. B 83, 085428 (2011)

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