Field-free anomalous junction and superconducting diode effect in spin-split superconductor/topological insulator junctions

T.H. Kokkeler, A.A. Golubov, F.S. Bergeret

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Abstract

We study the transport properties of a diffusive Josephson junction between two spin-split superconductors (SCs) made of SC-ferromagnetic insulator bilayers on top of a three-dimensional topological insulator. We derive the corresponding Usadel equation describing the quasiclassical Green's functions in these systems and first solve the equation analytically in the weak-proximity case. We demonstrate the appearance of an anomalous phase in the absence of an external magnetic field. We also explore nonreciprocal electronic transport. Specifically, we calculate the diode efficiency of the junction η by solving the Usadel equation. We obtain a sizable diode effect even at zero applied magnetic field. We discuss how the diode efficiency η depends on the different parameters and find a nonmonotonic behavior of η with temperature.

Original languageEnglish
Article number214504
JournalPhysical review B: Covering condensed matter and materials physics
Volume106
Issue number21
DOIs
Publication statusPublished - 1 Dec 2022

Keywords

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