Optical pumping and reversal of hole spin in InAs/GaAs quantum dots

摘要

We have obtained the optical pumping of hole spins, in p-doped InAs/GaAs quantum dots, via the generation of an intermediate trion state by a train of circularly polarized pulses. We show that we can optically control the orientation of the initialized hole spin, independently of the orientation of the intermediate trion state, by choosing the excitation energy of the circularly polarized light. This brings a supplementary degree of freedom for hole-spin manipulations in quantum dots.