Superconducting diode effect in Ising superconductors

Abstract

We study the superconducting diode effect (SDE) in an Ising superconductor with broken basal mirror symmetry in a parallel magnetic field. We show that in the presence of a small Rashba spin splitting, ${\Delta }_R$, the dominant Ising spin-orbit coupling (${\Delta }_I>>{\Delta }_R$) dramatically enhances the SDE efficiency compared to a Rashba superconductor with ${\Delta }_I=0$ and the same ${\Delta }_R$. The suppression of the SDE for ${\Delta }_I=0$ at ${\Delta }_R$ much larger than the critical temperature ($T_c$) is accidental. At ${\Delta }_R<<T_c$, the SDE efficiency is small because, to linear order, ${\Delta }_R$ can be removed by a gauge transformation. These two factors -- the accidental suppression of the SDE at large ${\Delta }_R$ and the systematic suppression at small ${\Delta }_R$ -- are eliminated by Ising spin-orbit coupling. As a result, SDE efficiency is substantially enhanced for ${\Delta }_I>>{\Delta }_R\ne 0$.

8 pages, 4 figures

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