Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance

When a quantum-dot electron spin is electrically driven to perform coherent Rabi oscillations, it can polarize nuclear spins through a resonance analogous to the Hartmann-Hahn effect known from NMR. Here, the authors theoretically analyze such a polarization rate in a generic setup including GaAs, Si, and Ge, and both electron and hole spin qubits. They present measurements in $n$-GaAs and estimate that the effect is also observable in Si. It might offer control over the Overhauser nuclear field in gated quantum dots.