Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Focus Session: Single Particle Sources for Electronic Devices II
(Joint session of HL and TT organized by HL)
TT 11.9: Vortrag
Montag, 7. März 2016, 18:00–18:15, H10
Energy harvester with coupled quantum dots — •Holger Thierschmann1,2, Rafael Sánchez3, Börn Sothmann4, Fabian Arnold1, Christian Heyn5, Wolfgang Hansen5, Hartmut Buhmann1, and Laurens W. Molenkamp1 — 1Experimentelle Physik 3, Universität Würzburg, Germany — 2Kavli Institute of Nanoscience, Faculty of Applied Sciences, Delft University of Technology, The Netherlands — 3Instituto de Cienca de Materiales de Madrid, CISC, Spain — 4Département de Physique Theoretique, Univeristé de Genève, Switzerland — 5Institute of Applied Physics, University of Hamburg, Germany
Multi-terminal thermoelectrics recieve an increasing attention because they allow for ways to separate heat and charge flow, thus pointing out a new route towards highly efficient thermoelectric devices. Here we present experiments on a three-terminal energy harvester with Coulomb coupled quantum dots (QD) following a recent proposal [1]. Energy is extracted from a hot electron reservoir via occupation fluctuations of a connected QD and is converted into a directed charge current in a conductor circuit which consists of another QD and two reservoirs at a lower temperature. Heat flow is mediated only through Coulomb interaction of the dots. The key ingredient of our device is an asymmetry in tunnel-coupling of the cold reservoirs and the QD which leads to rectification of charge fluctuations. Controlling this asymmetry with gate electrodes enables us to manipulate the direction of the resulting current even without changing the direction of heat flow. [1] R.Sánchez and M. Büttiker Phys. Rev. B 83 085428 (2011)