# Spin state mixing in InAs double quantum dots

## TL;DR

This paper investigates spin state mixing in InAs double quantum dots, revealing that spin-orbit coupling dominates hyperfine interactions and significantly influences electron transport in the Pauli spin blockade regime.

## Contribution

It provides a quantitative comparison of hyperfine and spin-orbit effects in InAs quantum dots, highlighting the dominance of spin-orbit coupling over hyperfine interactions.

## Key findings

- Spin-orbit coupling is over two orders of magnitude larger than hyperfine mixing energy.
- Spin-orbit effects are significant at magnetic fields of a few millitesla.
- Deviations from hyperfine mixing are observed at low magnetic fields.

## Abstract

We quantify the contributions of hyperfine and spin-orbit mediated singlet-triplet mixing in weakly coupled InAs quantum dots by electron transport spectroscopy in the Pauli spin blockade regime. In contrast to double dots in GaAs, the spin-orbit coupling is found to be more than two orders of magnitudes larger than the hyperfine mixing energy. It is already effective at magnetic fields of a few mT, where deviations from hyperfine mixing are observed.