DAMPING DISPERSION OF EXCITONIC POLARITONS IN CDS

被引:14
作者
PANTKE, KH
BROSER, I
机构
[1] Institut für Festkörperphysik, Technischen Universität Berlin, D-1000 Berlin 12
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 16期
关键词
D O I
10.1103/PhysRevB.48.11752
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We extract the damping dispersion GAMMA(omega) of excitonic polaritons in CdS on the basis of precise measurements of the transmission and reflectance. On the low-energy side of the A(n=1) exciton, the damping, which corresponds to the inverse dipole dephasing time, is independent of temperature, due to the scattering with impurities. On the high-energy side the damping increases with temperature and with the detuning from the resonance frequency due to the scattering with acoustic-phonons between different polariton modes. The probability of exciton-phonon scattering mediated by the deformation potential and by the piezoelectric effect is calculated and the measured damping spectrum is described qualitatively and quantitatively. By analyzing our results different relaxation channels of acoustic-phonon scattering are clearly discriminated.
引用
收藏
页码:11752 / 11758
页数:7
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