Dynamics of hole singlet triplet qubits with large g-factor differences
Mesoscale and Nanoscale Physics
2022-03-25 v1
Abstract
The spin-orbit interaction is the key element for electrically tunable spin qubits. Here we probe the effect of cubic Rashba spin-orbit interaction on mixing of the spin states by investigating singlet-triplet oscillations in a planar Ge hole double quantum dot. By varying the magnetic field direction we find an intriguing transformation of the funnel into a butterfly-shaped pattern. Landau-Zener sweeps disentangle the Zeeman mixing effect from the spin-orbit induced coupling and show that large singlet-triplet avoided crossings do not imply a strong spin-orbit interaction. Our work emphasizes the need for a complete knowledge of the energy landscape when working with hole spin qubits.
Cite
@article{arxiv.2111.05130,
title = {Dynamics of hole singlet triplet qubits with large g-factor differences},
author = {Daniel Jirovec and Philipp M. Mutter and Andrea Hofmann and Josip Kukucka and Alessandro Crippa and Frederico Martins and Andrea Ballabio and Daniel Chrastina and Giovanni Isella and Guido Burkard and Georgios Katsaros},
journal= {arXiv preprint arXiv:2111.05130},
year = {2022}
}