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arXiv · 1903.02819

Full electrostatic control of quantum interference in an extended trenched Josephson junction

Stefano Guiducci·Matteo Carrega·Fabio Taddei·Giorgio Biasiol·Hervé Courtois·Fabio Beltram·Stefan Heun
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Abstract

Hybrid semiconductor/superconductor devices constitute an important platform for a wide range of applications, from quantum computing to topological-state-based architectures. Here, we demonstrate full modulation of the interference pattern in a superconducting interference device with two parallel islands of ballistic InAs quantum wells separated by a trench, by acting independently on two side-gates. This so far unexplored geometry enables us to tune the device with high precision from a SQUID-like to a Fraunhofer-like behavior simply by electrostatic gating, without the need for an additional in-plane magnetic field. These measurements are successfully analyzed within a theoretical model of an extended tunnel Josephson junction, taking into account the focusing factor of the setup. The impact of these results on the design of novel devices is discussed.

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Stefano Guiducci, Matteo Carrega, Fabio Taddei, Giorgio Biasiol, Hervé Courtois, Fabio Beltram, Stefan Heun. 2019-03-07. Full electrostatic control of quantum interference in an extended trenched Josephson junction. https://doi.org/10.1103/physrevb.99.235419

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