ULTRAFAST NONLINEAR OPTICS IN GAAS/ALGAAS QUANTUM-WELLS

被引：9
|
作者：
HVAM, JM
BIRKEDAL, D
LYSSENKO, VG
ERLAND, J
SORENSEN, CB
机构：
[1] Mikroelektronik Centret, The Technical University of Denmark, Lyngby
[2] Institute of Microelectronics, The Technical University of Denmark, Moscow, 142432, Chernogolovka
[3] Fysisk Institut, Odense Universitet, DK-5230, Odense M
[4] The Niels Bohr Institute, Ørsted Laboratory, KØbenhavn Ø, DK-2100
来源：
PHYSICA SCRIPTA | 1994年 / 54卷
关键词：
D O I：
10.1088/0031-8949/1994/T54/045
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initial coherence and dephasing of quasi two-dimensional excitons and biexcitons in GaAs multiple quantum wells. The dephasing has contributions from phonon scattering, interface-roughness scattering and exciton-exciton scattering. Inhomogeneous broadening and generation of coherent wavepackets play a significant role in the coherent exciton dynamics. The incoherent exciton dynamics, diffusion and recombination, is studied by three-beam transient grating experiments. A significant difference in the interface roughness scattering of coherent and incoherent (thermalized) excitons is observed.
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页码：181 / 186
页数：6
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