Electron Momentum Distributions in Elemental Semiconductors Probed by Positrons
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Theoretical and experimental study of positron annihilation with core electrons in solids.
A theory for calculating the momentum distribution of annihilating positron-electron pairs in solids is presented. To test the theory, momentum distributions are measured by the Doppler broadening of the annihilation radiation for several bulk metals and semiconductors, as well as for semiconductor alloys and for positrons trapped at vacancies in semiconductors. The theory is based on a two-par...
متن کاملD ec 1 99 9 FIRST - PRINCIPLES CALCULATIONS OF POSITRON ANNIHILATION IN SOLIDS
We present first-principles approaches based on density functional theory for calculating positron states and annihilation characteristics in condensed matter. The treatment of the electron-positron correlation effects (the enhancement of the electron density at the positron with respect to mean-field density) is shown to play a crucial role when calculating the annihilation rates. A generalize...
متن کاملPositron Annihilation Spectroscopy: A Review of Applications in Nanomaterials Thin films and Semiconductors
A brief review have been presented highlighting the use of positron annihilation spectroscopic techniques for exploring the physical properties of materials from bulk to nanocrystalline sized particles. Even though a direct correlation of the changed annihilation characteristics with predictable changes in the solid is certainly not possible, positron annihilation can be used for obtaining comp...
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Rights: © 2006 American Physical Society (APS). This is the accepted version of the following article: Makkonen, I. & Hakala, M. & Puska, Martti J. 2006. Modeling the momentum distributions of annihilating electron-positron pairs in solids. Physical Review B. Volume 73, Issue 3. 035103/1-12. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.73.035103, which has been published in final form at ...
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This paper shows the scattering mechanism at diluted magneticsemiconductors. The doped magnetic atom produces a scattering potential due to becoupled of itinerant carrier spin of host material with magnetic momentum of the dopedmagnetic atom. Formulas of scattering event were rewritten by the plane waveexpansion and then the electron mobility of DMS was calculated. Calculations showKondo effect...
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تاریخ انتشار 2017