Pseudospin resonances reveal synthetic spin-orbit interaction

TL;DR

This paper demonstrates how pseudospin resonances in a double quantum dot system reveal a synthetic spin-orbit interaction, with detailed theoretical modeling and numerical validation of the phenomena.

Contribution

It introduces a minimal rate equation model that captures the resonance features and synthetic spin-orbit coupling effects observed in the system.

Findings

Resonances in the stability diagram are modulated by system parameters.

Ferromagnetic leads and pseudospin anisotropy cause resonance splitting and Fano shapes.

The minimal model accurately reproduces numerical results from the full system.

Abstract

We investigate a spin-full double quantum dot (DQD) coupled to the leads in a pseudospin valve configuration. The interplay of interaction and interference produces in the stability diagram a rich variety of resonances, modulated by the system parameters. In presence of ferromagnetic leads and pseudospin anisotropy, those resonances split, turn into dips and acquire a Fano shape thus revealing a synthetic spin-orbit coupling induced on the DQD. A set of rate equations derived for a minimal model captures those features. The model accurately matches the numerical results obtained for the full system in the framework of a generalized master equation and calculated within the cotunneling approximation.