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

来源：

JOURNAL OF CRYSTAL GROWTH | 1990年 / 101卷 / 1-4期

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

页码：341 / 345

页数：5

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