Using a single-particle atomistic pseudopotential method followed by a many-particle configuration interaction method, we investigate the geometry, electronic structure and optical transitions of a self-assembled InAs/GaAs quantum ring (QR), changing its shape continously from a lens-shaped quantum dot (QD) to a nearly one dimensional ring. We find that the biaxial strain in the ring is strongly asymmetric in the plane perpendicular to the QR growth direction, leading to giant optical anisotropy.
@article{arxiv.0805.1962,
title = {Giant optical anisotropy in cylindrical self-assembled InAs/GaAs quantum rings},
author = {Weiwei Zhang and Zhiqiang Su and Ming Gong and Chuan-Feng Li and Guang-Can Guo and Lixin He},
journal= {arXiv preprint arXiv:0805.1962},
year = {2009}
}