We develop a theory for the spin-echo dynamics of a heavy hole in a quantum dot, accounting for both hyperfine- and electric-field-induced fluctuations. We show that a moderate applied magnetic field can drive this system to a motional-averaging regime, making the hyperfine interaction ineffective as a decoherence source. Furthermore, we show that decay of the spin-echo envelope is highly sensitive to the geometry. In particular, we find a specific choice of initialization and {\pi}-pulse axes which can be used to study intrinsic hyperfine-induced hole-spin dynamics, even in systems with substantial electric-field-induced dephasing. These results point the way to designed hole-spin qubits as a robust and long-lived alternative to electron spins.
@article{arxiv.1208.4898,
title = {Spin-echo dynamics of a heavy hole in a quantum dot},
author = {Xiaoya Judy Wang and Stefano Chesi and William A. Coish},
journal= {arXiv preprint arXiv:1208.4898},
year = {2012}
}
Comments
5 pages, 4 figures; v2: table added, discussion simplified, final published version