Size-dependent spintronic properties of dilute magnetic semiconductor nanocrystals |
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| Authors: | Huang Xiangyang Makmal Adi Chelikowsky James R Kronik Leeor |
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| Institution: | Department of Chemical Engineering and Materials Science, Institute for the Theory of Advanced Materials in Information Technology, Digital Technology Center, University of Minnesota, Minneapolis, Minnesota 55455, USA. |
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| Abstract: | The electronic structure and magnetic properties of Mn-doped Ge, GaAs, and ZnSe nanocrystals are investigated using real space ab initio pseudopotentials constructed within the local spin-density approximation. The ferromagnetic and half-metallicity trends found in the bulk are preserved in the nanocrystals. However, the Mn-related impurity states become much deeper in energy with decreasing nanocrystalline size, causing the ferromagnetic stabilization to be dominated by double exchange via localized holes rather than by a Zener-like mechanism. |
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