DEPHASING OF EXCITONS IN A CDTE/CD0.86MN0.14TE MULTIPLE-QUANTUM-WELL

被引：9

作者：

HELLMANN, R ^{[1
]}

KOCH, M ^{[1
]}

FELDMANN, J ^{[1
]}

CUNDIFF, ST ^{[1
]}

GOBEL, EO ^{[1
]}

YAKOVLEV, DR ^{[1
]}

WAAG, A ^{[1
]}

LANDWEHR, G ^{[1
]}

机构：

[1] UNIV WURZBURG,INST PHYS,D-97074 WURZBURG,GERMANY

来源：

JOURNAL OF CRYSTAL GROWTH | 1994年 / 138卷 / 1-4期

关键词：

D O I：

10.1016/0022-0248(94)90908-3

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The dephasing of heavy- and light-hole excitons in CdTe/Cd0.86Mn0.14Te multiple quantum wells is investigated by means of subpicosecond transient four-wave mixing. We find dephasing times on the order of 2 ps, corresponding to a homogeneous linewidth of 0.65 meV, for the free heavy-hole exciton at 5 K and moderate exciton density. Density and temperature dependent measurements of the homogeneous linewidth allow the determination of the interaction strength for exciton-exciton and exciton-phonon scattering as well as of the residual contribution due to extrinsic scattering processes. Simultaneous excitation of heavy- and light-hole excitons leads to the appearance of quantum beats, allowing the determination of the light-hole dephasing time. We find that the light hole dephases 4-5 times faster than the heavy-hole exciton. This faster dephasing of the light-hole exciton is attributed to a resonant coupling between the ls light-hole and the 2s heavy-hole exciton state. The results are compared to published data for GaAs/Al1-xGaxAs quantum wells.

引用

页码：791 / 795

页数：5

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