Coulomb-Blockade directional coupler
P. Pingue (1), V. Piazza (1), F. Beltram (1), I. Farrer (2), D.A., Ritchie (2), M. Pepper (2) ((1) NEST-INFM & Scuola Normale Superiore, Pisa,, Italy; (2) Cavendish Laboratory, University of Cambridge, Cambridge, United, Kingdom)
TL;DR
This paper introduces a tunable Coulomb Blockade-based directional coupler using coupled electron waveguides and a quantum dot, demonstrating oscillations and potential for electronic multiplexers at cryogenic temperatures.
Contribution
It presents a novel Coulomb Blockade directional coupler design with experimental validation and discusses its application for electronic multiplexers.
Findings
Large transconductance oscillations observed up to 4.2 K
Successful interpretation of results via Coulomb Blockade theory
Potential for integration into electronic multiplexers
Abstract
A tunable directional coupler based on Coulomb Blockade effect is presented. Two electron waveguides are coupled by a quantum dot to an injector waveguide. Electron confinement is obtained by surface Schottky gates on single GaAs/AlGaAs heterojunction. Magneto-electrical measurements down to 350 mK are presented and large transconductance oscillations are reported on both outputs up to 4.2 K. Experimental results are interpreted in terms of Coulomb Blockade effect and the relevance of the present design strategy for the implementation of an electronic multiplexer is underlined.
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