We have explored phase coherent transport of holes in two p-type GaAs quantum rings with orbital radii 420 nm and 160 nm fabricated with AFM oxidation lithography. Highly visible Aharonov-Bohm (AB) oscillations are measured in both rings, with an amplitude of the oscillations exceeding 10% of the total resistance in the case of the ring with a radius of 160 nm. Beside the h/e oscillations, we resolve the contributions from higher harmonics of the AB oscillations. The observation of a local resistance minimum at B=0 T in both rings is a signature of the destructive interference of the holes' spins. We show that this minimum is related to the minimum in the h/2e oscillations.
@article{arxiv.0711.0489,
title = {Aharonov-Bohm oscillations in p-type GaAs quantum rings},
author = {Boris Grbic and Renaud Leturcq and Thomas Ihn and Klaus Ensslin and Dirk Reuter and Andreas D. Wieck},
journal= {arXiv preprint arXiv:0711.0489},
year = {2008}
}
Comments
Proceedings of EP2DS-17, Genova 2007; Accepted for Physica E; 3 pages, 3 figures