Superconducting Diode Effect in Topological Hybrid Structures

Currently, the superconducting diode effect (SDE) is being actively discussed, due to its large application potential in electronics. In particular, hybrid structures, based on three-dimensional (3D) topological insulators, are among best candidates, their having strongest spin–orbit coupling (SOC). Most theoretical studies SDE focus either a full numerical calculation, which often rather complicated, or phenomenological approach. present paper, we compare linearized and nonlinear microscopic approaches superconductor/ferromagnet/3D insulator (S/F/TI) structure. Employing quasiclassical Green’s function formalism solve problem self-consistently. We show that results obtained by approximation not qualitatively different from solution. The main distinction between two methods was quantitative, i.e., they yielded supercurrent amplitudes. However, when calculating so-called quality factor quantitative difference eliminated both result good agreement.