Resonant current from singlet-triplet state mixing in coupled quantum dots

TL;DR

This paper investigates how resonant current in coupled quantum dots, driven by electric fields, reveals complex interference patterns that provide insights into singlet-triplet state mixing, using a Floquet-Markov quantum transport model.

Contribution

It introduces a detailed Floquet-Markov model to analyze resonant current patterns in spin-orbit coupled quantum dots under various driving conditions.

Findings

Resonant current exhibits complex interference patterns.

Patterns provide insights into singlet-triplet state mixing.

Model predicts current behavior for different driving parameters.

Abstract

Electrically driven spin resonances in double quantum dots can lift the spin blockade and give rise to a resonant current. This current can probe the properties of coupled two-spin states for different quantum dot configurations. Using a Floquet-Markov quantum transport model we compute the resonant current for different driving amplitudes and ac field frequencies in spin-orbit coupled quantum dots. We show that the resonant current has a very rich interference pattern which can give valuable insight into the singlet-triplet state mixing.