We investigate the excitonic properties of a core-multishell semiconductor nanowire with type-II band mismatch, i.e. with spatially separated electrons and holes, under an external magnetic field. Our results demonstrate that, depending on the core wire radius, the carrier in the type-II band exhibits either a quantum dot-like or a quantum ring-like energy spectrum, corresponding to a carrier confinement in the core wire or in the outer shell, respectively. In the latter, a shell-to-core confinement transition can be induced by increasing the magnetic field intensity, which may lead to interesting photocurrent properties of these confining structures, tunable by the external field.
@article{arxiv.1311.5503,
title = {Magnetic field induced shell-to-core confinement transition in type-II semiconductor quantum wires},
author = {R. Macêdo and J. Costa e Silva and Andrey Chaves and G. A. Farias and R. Ferreira},
journal= {arXiv preprint arXiv:1311.5503},
year = {2013}
}