Pinned Magnetic Impurity Levels in Doped Quantum Dots
msra(2006)
摘要
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.
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关键词
density function theory,binding energy,quantum confinement,magnetic circular dichroism,materials science,exchange interaction,quantum dot
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