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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Tunnelling and Josephson Junctions I

TT 6.9: Vortrag

Montag, 18. März 2024, 12:00–12:15, H 3010

A diode effect in an Ising-superconductor Josephson junction — •Sourabh Patil¹, Gaomin Tang^2,3, and Wolfgang Belzig¹ — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²Graduate School of China Academy of Engineering Physics, 100193 Beijing, China — ³Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Two Ising superconductors proximitized by ferromagnetic layers can be used to build a Josephson junction. This setup allows for tunable spin-triplet pairing correlations, letting us control charge and spin supercurrents through the in-plane magnetic exchange fields [1]. Recently, there has been significant interest in the study of the superconducting diode effect. A Josephson diode allows a greater dissipationless supercurrent to flow in one direction compared to the other [2].

Here, we study a new kind of Josephson diode that uses supercurrent interference. It is created through a Josephson junction, incorporating a small non-magnetic barrier with perfect transmission combined with a fully polarized ferromagnetic barrier in the tunneling limit. The superposition of the current-phase relations from these two barriers results in the diode effect in the junction. This unique design attains diode efficiencies of up to 20

[1] G. Tang et al., Phys. Rev. B 104 (2021) L241413

[2] R. Souto et al., Phys. Rev. Lett. 129 (2022) 267702

Keywords: Ising superconductors; Josephson junction; Diode effect; Andreev bound states; spin-triplet