Monday, July 15, 2013

1307.3260 (Samuel G. Carter et al.)

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

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.
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