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

Phys. Rev. B 72, 115413 – Published 9 September 2005
P. Babu Dayal, B. R. Mehta, and P. D. Paulson


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.

DOI: http://dx.doi.org/10.1103/PhysRevB.72.115413

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  • Received 25 April 2005
  • Revised 8 July 2005
  • Published 9 September 2005
  • Publisher error corrected 13 September 2005

© 2005 The American Physical Society

Authors & Affiliations

P. Babu Dayal1, B. R. Mehta1,*, and P. D. Paulson2

  • 1Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
  • 2Institute of Energy Conversion, University of Delaware, Newark, Delaware 19716, USA

  • *Corresponding author. Email address: brmehta@physics.iitd.ernet.in


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