FEMTOSECOND DEPHASING IN CDSXSE1-X MIXED-CRYSTALS - THE ROLE OF LOCALIZED BIEXCITONS

被引：39

作者：

BIGOT, JY

DAUNOIS, A

OBERLE, J

MERLE, JC

机构：

[1] Groupe d'Optique Nonlinéaire et d'Optoélectronique, Institut de Physique et Chimie des Matériaux de Strasbourg, 67084 Strasbourg Cedex

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.71.1820

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dephasing of excitonic localized states is investigated in CdSxSe1-x mixed crystals at 2 K with low intensity femtosecond optical pulses. We observe a fast relaxation process which is first reported here. It is shown to be related to the creation of localized biexcitons via the exciton-biexciton transitions which act as an additional dephasing mechanism with a time constant T2ex-bi of 700 fs. The coherence between excitonic and biexcitonic states, which manifests by 800 fs period beats, is studied in detail. A simple model is presented which describes both the fast initial decay and the beating behavior.

引用

页码：1820 / 1823

页数：4

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