Pseudospin resonances reveal synthetic spin-orbit interaction

We investigate a spinful double quantum dot coupled to leads in a pseudospin valve configuration. The interplay of interaction and interference produces, in the stability diagram, a rich variety of current resonances modulated by the system parameters. In the presence of ferromagnetic leads and pseudospin anisotropy, those resonances split, turn into dips, and acquire a Fano shape, thus revealing a synthetic spin-orbit interaction induced on the double quantum dot. 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 next to leading order approximation.

Automated summary

The study reveals that when a spinful double quantum dot is coupled to leads in a pseudospin valve configuration, the interaction and interference can lead to a rich variety of current resonances, which are modulated by system parameters. Furthermore, in the presence of ferromagnetic leads and pseudospin anisotropy, the resonances split, turn into dips, and acquire a Fano shape, indicating the presence of a synthetic spin-orbit interaction on the double quantum dot. The results are accurately captured by a set of rate equations derived for a minimal model and matched with numerical results obtained within a next to leading order approximation in the framework of a generalized master equation.