Authors: N. Cavassilas, F. Aniel and G. Fishman
Affilation: CNRS, France
Pages: 411 - 414
Keywords: k.p. theory, strain, SiGe
A strain Hamiltonian Hst, associated with a sps* k.p Hamiltonian Hkp is used to descibe the valence band and the first two conduction bands of a strained indirect semiconductor. Hst takes into accoutn the Bir-Pikus parameters (a, b) used up to now to describe only the Brillouin zone center. The Hkp+Hst Hamiltonian allows one to calculate the energy dispersio nall over the Brillouin zone. The method is applied to Si strained on Sil-xGex alloy. We do not use the local (in k space) deformation potentials Pu, and pd conventionally used in indirect gap semiconductor to describe the conduction band. The energy band gap, the conduction bands split into the four equivalent in-plane valleys delta4 and the two valleys along the growth direction delta2 which result from teh above Hkp+Hst Hamiltonian are in very good agreement with other publications.