摘要
From the intensity ratio of the folded longitudinal acoustic phonons with respect to the longitudinal acoustic phonon in a Ge_(0.51)Si_(0.49)/Si superlattice(SL),we obtained a photoelastic constant ratio of 6.6 for Ge_(0.51)Si_(0.49) alloy with respect to Si in the SL at wavelength 5145 A,which is 2.6 times greater than that obtainedby[He Phys.Rev.B 39(1989)5919]in a Ge_(0.5)Si_(0.5)/Si SL.
基金
Supported by the National Natural Science Foundation of China,the Foundation of Surface Physics Laboratory of Fudan University,National Laboratory for Superlattices and Microstructure and the Doctoral Program Foundation of Institution of Higher Education.
