Revanth Kodoru, Atanu Saha, et al.
arXiv
The localized and resonant vibrational modes of a substitutional oxygen defect in GaP have been computed with the use of the Green's-function approach. A 15-parameter version of the deformable-dipole model was used to describe the lattice dynamics of bulk GaP. A defect, consisting of a mass perturbation at the substitutional site and a perturbation among the nearest- and second-nearest-neighbor short-range interactions near the oxygen atom, was considered. The local modes, labeled by symmetry, are presented as a function of the interaction perturbation. Quantitative agreement with experimental results for O0 and O+ defects is obtained by weakening the O (-Ga and -P) short-range interactions to 38% of the bulk values while weakening the Ga-P back bonds. With the inclusion of Coulomb effects, this corresponds to an effective O-lattice force constant of 3.5 eV/2, which is 25% of the bulk, P-lattice value. © 1984 The American Physical Society.
Revanth Kodoru, Atanu Saha, et al.
arXiv
Sang-Min Park, Mark P. Stoykovich, et al.
Advanced Materials
Oliver Schilter, Alain Vaucher, et al.
Digital Discovery
Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997