Tetragonal and trigonal deformations in zinc-blende semiconductors : a tight-binding point of view

Abstract

The deformation potentials of cubic semiconductors are re-examined from the point of view of the extended-basis $s{p}^3{d}^5{s}^{\ast }$ tight-binding model. Previous parametrizations had failed to account properly for trigonal deformations, even leading to incorrect sign of the acoustic component of the shear deformation potential {\it d}. The strain-induced shifts and splittings of the on-site energies of the p- and d-orbitals are shown to play a prominent role in obtaining satisfactory values of deformation potentials both at the zone center and zone extrema. The present approach results in excellent agreement with available experimental data and ab-initio calculations.

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