We have experimentally investigated the hole states in a gated vertical strained Si/SiGe quantum dot. We demonstrate the inhomogeneous strain relaxation on the lateral surface creates a ring-like potential near the perimeter of the dot, which can confine hole states exhibiting quantum ring characteristics. The magnetotunneling spectroscopy exhibits the predicted periodicity of energy states in \phi/\phi0, but the magnitude of the energy shifts is larger than predicted by simple ring theory. Our results suggest a new way to fabricate and study quantum ring structures.
@article{arxiv.cond-mat/0204457,
title = {Strain-induced quantum ring hole states in a gated vertical quantum dot},
author = {Jun Liu and A. Zaslavsky and L. B. Freund},
journal= {arXiv preprint arXiv:cond-mat/0204457},
year = {2009}
}