標題: | Magnetic anisotropy in symmetric magnetic colloidal quantum dots doped with few Mn(2+) impurities |
作者: | Cheng, Shun-Jen 電子物理學系 Department of Electrophysics |
公開日期: | 1-六月-2009 |
摘要: | We present numerical exact diagonalization studies of the magnetism in magnetic II-VI colloidal semiconductor quantum dots charged with controlled number of electrons coupled to few magnetic-ion (Mn(2+)) dopants. The interplay between various relevant spin interactions and the discrete nature of Mn(2+) spin distribution is shown to be essential in the magnetism of few Mn(2+)-doped quantum dots. An interesting revealed feature is the existence of pronounced magnetic anisotropies in symmetric magnetic quantum dots, which are related to the orbital quenchings induced by electron-Mn spin interactions. The orbital quenching effects further lead to significant deviations of the magnetizations of randomly Mn-doped dots from the standard Brillouin-function descriptions. |
URI: | http://dx.doi.org/10.1103/PhysRevB.79.245301 http://hdl.handle.net/11536/7137 |
ISSN: | 1098-0121 |
DOI: | 10.1103/PhysRevB.79.245301 |
期刊: | PHYSICAL REVIEW B |
Volume: | 79 |
Issue: | 24 |
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顯示於類別: | 期刊論文 |