標題: Magnetic anisotropy in symmetric magnetic colloidal quantum dots doped with few Mn2+ impurities
作者: Cheng, Shun-Jen
電子物理學系
Department of Electrophysics
關鍵字: cadmium compounds;doping profiles;II-VI semiconductors;impurity distribution;magnetic anisotropy;manganese;semiconductor doping;semiconductor quantum dots;semimagnetic semiconductors
公開日期: 1-Jun-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 (Mn2+) dopants. The interplay between various relevant spin interactions and the discrete nature of Mn2+ spin distribution is shown to be essential in the magnetism of few Mn2+-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/11536/149801
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.79.245301
期刊: PHYSICAL REVIEW B
Volume: 79
Issue: 24
起始頁: 0
結束頁: 0
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