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• W2154795999 abstract "Quantum-confined positrons are sensitive probes for determining the electronic structure of nanoclusters embedded in materials. In this work, a depth-selective positron annihilation 2D-ACAR (two-dimensional angular correlation of annihilation radiation) method is used to determine the electronic structure of Li nanoclusters formed by implantation of ${10}^{16}ensuremath{-}{mathrm{cm}}^{ensuremath{-}2}30ensuremath{-}mathrm{keV}{ }^{6}mathrm{Li}$ ions in MgO (100) and (110) crystals and by subsequent annealing at 950 K. Owing to the difference between the positron affinities of lithium and MgO, the Li nanoclusters act as quantum dots for positrons. 2D-ACAR distributions for different projections reveal a semicoherent fitting of the embedded metallic Li nanoclusters to the host MgO lattice. Ab initio Korringa-Kohn-Rostoker calculations of the momentum density show that the anisotropies of the experimental distributions are consistent with an fcc crystal structure of the Li nanoclusters. The observed reduction of the width of the experimental 2D-ACAR distribution is attributed to positron trapping in vacancies associated with Li clusters. This work proposes a method for studying the electronic structure of metallic quantum dots embedded in an insulating material." @default.
• W2154795999 created "2016-06-24" @default.
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• W2154795999 date "2002-08-30" @default.
• W2154795999 modified "2023-09-26" @default.
• W2154795999 title "Electronic structure and orientation relationship of Li nanoclusters embedded in MgO studied by depth-selective positron annihilation two-dimensional angular correlation" @default.
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• W2154795999 doi "https://doi.org/10.1103/physrevb.66.075426" @default.
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