We show that the hyperfine mediated dynamics of heavy hole states confined in neutral self- assembled quantum dots leads to a nuclear spin diffusion mechanism. It is found that the oftentimes neglected effective heavy hole hyperfine non-collinear interaction is responsible for the low degree of nuclear spin polarization in neutral quantum dots. Moreover, our results demonstrate that after pumping the nuclear spin state is left in a complex mixed state, from which it is not straightforward to deduce the sign of the Ising-like interactions.
@article{arxiv.1403.0490,
title = {Nuclear Spin Diffusion Mediated by Heavy Hole Hyperfine Non-Collinear Interactions},
author = {Hugo Ribeiro and Franziska Maier and Daniel Loss},
journal= {arXiv preprint arXiv:1403.0490},
year = {2014}
}
Comments
5 pages, 3 figures. Supplemental material available in the sources