Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 106: Transport, magnetotransport and quantum Hall physics
HL 106.5: Vortrag
Freitag, 20. März 2015, 11:00–11:15, EW 202
Voltage fluctuation to current converter with coupled quantum dots — •Pierre Pfeffer1, Fabian Hartmann1, Sven Höfling1, 2, Martin Kamp1, and Lukas Worschech1 — 1Technische Physik, Physikalisches Institut, Universität Würzburg and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany — 2SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
Converting random fluctuations into useful energy is a major challenge in electronics and has triggered substantial experimental and theoretical work ranging from solid state to biological systems from the classical down to the quantum regime. Following recent proposals by Sothmann, Sanchez, Jordan and Büttiker [1,2], we realized a Coulomb-coupled quantum dot (QD) system and demonstrate a direct current in one part of the QD circuit due to charge fluctuations in the other part of the QD circuit. Both the direction and the amplitude of the current can be switched by an electric field superimposed on the open QD. No particle exchange between the two QD subsystems is involved and dependent on the noise amplitude, maximum output powers are found in the pW region.
[1] R. Sanchez and M. Büttiker, Phys. Rev. B 83, 085428 (2011).
[2] B. Sothmann, R. Sanchez, A. N. Jordan and M. Büttiker, Phys. Rev. B 85, 205301 (2012).