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Spin-orbit splitting and critical point energy at Γ and L points of cubic CdTe nanoparticles: Effect of size and nonspherical shape

Dayal, P. Babu and Mehta, B. R. and Paulson, P. D. (2005) Spin-orbit splitting and critical point energy at Γ and L points of cubic CdTe nanoparticles: Effect of size and nonspherical shape. PHYSICAL REVIEW B, 72 (11). p. 115413. ISSN 10980121

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Official URL: http://prola.aps.org/abstract/PRB/v72/i11/e115413

Abstract

This study reports the observation of changes in critical point energy at Γ and L points and an increase in spin-orbit splitting energy of cubic CdTe nanoparticles in comparison to the bulk single-crystal value. ε1 and ε2 spectra of CdTe nanoparticles, accurately derived from spectroscopic ellipsometry measurements on CdTe nanoparticles dispersed in SiO2 films, show E0 , E0+Δ0 , E1 , and E1+Δ1 critical points at 1.75, 2.74, 3.29, and 3.83 eV, respectively. Glancing-angle x-ray diffraction and high-resolution transmission electron microscopy investigations confirm cubic CdTe nanoparticles with good crystallinity and a nonspherical shape. Variable magnitudes of size-induced stress along the minor and major axes cause dissimilar shifts of heavy-hole and split-off bands resulting in a positive contribution to spin-orbit splitting energy, in addition to the small size.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5067
Deposited By:JNCASR
Deposited On:27 May 2009 10:15
Last Modified:27 May 2009 10:15

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