Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 61: Quantum Dots and Wires: Transport Properties
HL 61.4: Vortrag
Mittwoch, 9. März 2016, 15:30–15:45, H16
Logical Stochastic Resonance and its Applications in a Coulomb-Coupled Quantum-Dot Rectifier — •Pierre Pfeffer1, Fabian Hartmann1, Igor Neri2, Anne Schade1, Monika Emmerling1, Martin Kamp1, Luca Gammaitoni2, Sven Höfling1, 3, and Lukas Worschech1 — 1Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2NiPS Laboratory, Dipartimento di Fisica, Universita di Perugia, I-06100 Perugia, Italy — 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
Although noise is largely considered as an adverse factor in electronics, effects like logical stochastic resonance (LSR) can render electronic fluctuations useful. We observe LSR in a semiconductor system consisting of two Coulomb-coupled quantum dots (QDs) and show that voltage fluctuations applied to one of the QDs lead to a rectified and controllable current in the other QD. The system is able to offer several logic functionalities, among them the two universal logic gates NOR and NAND and the logic XOR, which can be accessed and switched between by applying suited noise and gate voltages. Benefiting from this, we demonstrate two different realizations of a half adder and examine their optimal modes of operation. As the presented devices draw their power solely from electronic fluctuations they can be considered as advancements in the field of energy efficient and autonomous electronics.