We compare energy spectra, electron localization and optical absorption of square and diamond quantum rings and analyze how sample geometry affects those features. We show that low energy levels of diamond rings form two groups delocalized between opposite corners which results in increased number of optical transitions. We also show that contacts applied to corner areas allow for continuous change between square- and diamond-like behavior of the same sample, irrespective of its shape.
@article{arxiv.1505.00207,
title = {Symmetry dependent electron localization and optical absorption of polygonal quantum rings},
author = {Anna Sitek and Vidar Gudmundsson and Andrei Manolescu},
journal= {arXiv preprint arXiv:1505.00207},
year = {2015}
}