The Josephson diode effect in supercurrent interferometers
- URL: http://arxiv.org/abs/2205.04469v1
- Date: Mon, 9 May 2022 18:00:00 GMT
- Title: The Josephson diode effect in supercurrent interferometers
- Authors: Rub\'en Seoane Souto, Martin Leijnse, Constantin Schrade
- Abstract summary: A Josephson diode is a non-reciprocal circuit element that supports a larger dissipationless supercurrent in one direction than in the other.
We propose and theoretically study a class of Josephson diodes based on supercurrent interferometers containing mesoscopic Josephson junctions.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: A Josephson diode is a non-reciprocal circuit element that supports a larger
dissipationless supercurrent in one direction than in the other. In this work,
we propose and theoretically study a class of Josephson diodes based on
supercurrent interferometers containing mesoscopic Josephson junctions, such as
point contacts or quantum dots, which are not diodes themselves but possess
non-sinusoidal current-phase relations. We show that such Josephson diodes have
several important advantages, like being electrically tunable and requiring
neither Zeeman splitting nor spin-orbit coupling, only time-reversal breaking
by a magnetic flux. We also show that our diodes have a characteristic AC
response, revealed by the Shapiro steps. Even the simplest realization of our
Josephson diode paradigm that relies on only two junctions can achieve
efficiencies of up to $\sim40\%$ and, interestingly, far greater efficiencies
are achievable by concatenating multiple interferometer loops.
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