Pinned Magnetic Impurity Levels in Doped Quantum Dots

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

Spectroscopic data demonstrate that impurity D/A levels in doped semiconductor nanostructures are energetically pinned, resulting in variations in D/A binding energies with increasing quantum confinement. Using magnetic circular dichroism spectroscopy, the donor binding energies of Co2+ ions in colloidal ZnSe quantum dots have been measured as a function of quantum confinement and analyzed in conjunction with ab initio density functional theory calculations. The resulting experimental demonstration of pinned impurity levels in quantum dots has far-reaching implications for physical phenomena involving impurity-carrier interactions in doped semiconductor nanostructures, including in the emerging field of semiconductor spintronics where magnetic-dopant-carrier exchange interactions define the functionally relevant properties of diluted magnetic semiconductors.
18 pages, 4 figures, submitted for publication

Keywords

Materials Science

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/114806

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0608734
 http://arxiv.org/abs/cond-mat/0608734

Collections

arXiv