Dynamics of hole singlet triplet qubits with large g-factor differences
- Resource Type
- Working Paper
- Authors
- Jirovec, Daniel; Mutter, Philipp M.; Hofmann, Andrea; Kukucka, Josip; Crippa, Alessandro; Martins, Frederico; Ballabio, Andrea; Chrastina, Daniel; Isella, Giovanni; Burkard, Guido; Katsaros, Georgios
- Source
- Subject
- Condensed Matter - Mesoscale and Nanoscale Physics
- Language
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.