This study reports the observation of changes in critical point energy at and points and an increase in spin-orbit splitting energy of cubic CdTe nanoparticles in comparison to the bulk single-crystal value. and spectra of CdTe nanoparticles, accurately derived from spectroscopic ellipsometry measurements on CdTe nanoparticles dispersed in films, show , , , and 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.
DOI: http://dx.doi.org/10.1103/PhysRevB.72.1154132 More
- Received 25 April 2005
- Revised 8 July 2005
- Published 9 September 2005
- Publisher error corrected 13 September 2005
© 2005 The American Physical Society