QUROPE Quantum Information Processing and Communication in Europe

We investigate the electric manipulation of a single electron spin in a single gate-defined quantum dot. We observe that so-far neglected shifts between the hyperfine and spin-orbit mediated electric dipole spin resonance conditions have important consequences at high magnetic fields. In experiments using adiabatic rapid passage to robustly invert the electron spin, the resonance shifts lead to an unusually wide and asymmetric response as a function of magnetic field. Simulations support the interpretation of the lineshape in terms of four different resonance conditions. These findings may lead to enhanced control of dynamic nuclear polarization in quantum dots.