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Josephson diode effect in a ballistic single-channel nanowire

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arxiv 2404.01429 v2 pith:HGZU2B6S submitted 2024-04-01 cond-mat.mes-hall cond-mat.supr-con

Julia S. Meyer , Manuel Houzet This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.supr-con
keywords effectdiodeanalyticalcouplingdifferentfieldjosephsonnanowire
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When time-reversal and inversion symmetry are broken, superconducting circuits may exhibit a so-called diode effect, where the critical currents for opposite directions of the current flow differ. In recent years, this effect has been observed in a multitude of systems and the different physical ingredients that may yield such an effect are well understood. On a microscopic level, the interplay between spin-orbit coupling and a Zeeman field may give rise to a diode effect in a single Josephson junction. However, so far there is no analytical description of the effect within a simple model. Here we study a single channel nanowire with Rashba spin-orbit coupling and in the presence of a Zeeman field. We show that the different Fermi velocities and spin projections of the two pseudo-spin bands lead to a diode effect. Simple analytical expressions for the diode efficiency can be obtained in limiting cases.

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  1. Field-free Josephson diode effect in interacting chiral quantum dot junctions

    cond-mat.supr-con 2024-11 conditional novelty 6.0 of 10

    Electron-electron interactions in a chiral quantum dot can create a spin imbalance that, together with the dot's chirality, produces a field-free Josephson diode effect with rectification up to 72 percent.

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