EDSR spectroscopy of a single hole confined in a gated GaAs double quantum dot*

This research presents theoretical and experimental studies of a single hole confined in a gated GaAs double quantum dot (DQD) [1,2], using microwave excitation to achieve Electric Dipole Spin Resonance (EDSR). Weak hyperfine hole-nuclear interactions and strong spin-orbit interactions (SOI) make the hole spin a promising candidate for a qubit. Electrical excitation via EDSR, apart from performing spin qubit rotations, is a powerful spectroscopic tool in determining the energy spectra of the confined hole. When plotted as a function of interdot detuning, B-field, and interdot tunneling, the spectra reveal tunability of the hole effective g-factor using electrical means. EDSR also reveals hybridization of hole orbitals and lead states, giving another mechanism of the g-factor tuning. The calculated spectra are compared to the experimental results of EDSR spectroscopy detected in transport in the high source-drain voltage regime. Given the accurate fits to the experimental data, the model can be used as a predictive tool in design of coherent control of the hole spin qubit.

[1] S. Studenikin et al., Communications Physics 2, 159 (2019)
[2] A. Bogan et al., Phys. Rev. Lett. 118, 167701 (2017)