Dynamics of hole singlet-triplet qubits with large g-factor differences - Jirovec, Daniel; Mutter, Philipp M.; Hofmann, Andrea C; Crippa, Alessandro; Rychetsky, Marek; Craig, David L.; Kukucka, Josip; Martins, Frederico; Ballabio, Andrea; Ares, Natalia; Chrastina, Daniel; Isella, Giovanni; et al. (Physical Review Letters, 2022)
The spin-orbit interaction permits to control the state of a spin qubit via electric fields. For holes it is particularly strong, allowing for fast all electrical qubit manipulation, and yet an in-depth understanding of this interaction in hole systems is missing. Here we investigate, experimentally and theoretically, the effect of the cubic Rashba spin-orbit interaction on the mixing of the spin states by studying singlet-triplet oscillations in a planar Ge hole double quantum dot. Landau-Zener sweeps at different magnetic field directions allow us to disentangle the effects of the spin-orbit induced spin-flip term from those caused by strongly site-dependent and anisotropic quantum dot g tensors. Our work, therefore, provides new insights into the hole spin-orbit interaction, necessary for optimizing future qubit experiments.
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Rights: https://creativecommons.org/licenses/by/4.0/
Keywords: article