THEORY OF THE DYNAMIC STARK-EFFECT OF EXCITONS IN CDS

被引:5
|
作者
ZIMMERMANN, R
HARTMANN, M
机构
[1] Zentralinstitut für Elektronenphysik, Akademie der Wissenschaften der DDR, DDR-1086 Berlin
关键词
Equations of Motion - Phonons;
D O I
10.1016/0022-0248(90)90992-T
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The dynamical Stark effect of excitons in CdS bulk crystals has been measured recently using differential transmission spectroscopy (DTS). A general DTS formula is derived taking into account exciton-exciton interaction. A perculiar influence of the pump and test polarization on its magnitude is predicted. Concerning the dephasing (transverse relaxation), coupling to optical phonons is treated on a microscopic level. A density-matrix approach leads to the imaginary part of the exciton-phonon self energy. Its strong frequency dependence which shows up as a non-Markoff relaxation strongly suppresses the relaxation for the pump pulse at large detuning. A more sophisticated approach using the non-equilibrium Green function gives deeper insight into the underlying scattering processes. © 1989.
引用
收藏
页码:341 / 345
页数:5
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