All-electrical control of hole singlet-triplet spin qubits at low-leakage points

We study the effect of the spin-orbit interaction on heavy holes confined in a double quantum dot in the presence of a magnetic field of arbitrary direction. Rich physics arise as the two hole states of different spin are not only coupled by the spin-orbit interaction but additionally by the effect of site-dependent anisotropic gtensors. It is demonstrated that these effects may counteract in such a way as to cancel the coupling at certain...