1307.3260 (Samuel G. Carter et al.)

Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in
an InAs Quantum Dot    [PDF]

Samuel G. Carter, Sophia E. Economou, Alex Greilich, Edwin Barnes, Timothy M. Sweeney, Allan S. Bracker, Daniel Gammon

We show that the hyperfine interaction between a hole spin and nuclear spins in a quantum dot can generate a significant nuclear polarization that strongly modifies hole spin measurements. Compared to electrons, holes have a weaker hyperfine interaction that is anisotropic. Our measurements of the hole spin dynamics using optical pulse sequences show a longer dephasing time due to the weaker interaction, accompanied by strong modulation of the precessing spin amplitude at the indium nuclear precession frequency. This modulation is due to a nuclear polarization that depends on the coherent precession of nuclear spins and the anisotropy of the interaction.

View original: http://arxiv.org/abs/1307.3260