Stimulated scattering of indirect excitons in coupled quantum wells: Signature of a degenerate Bose-gas of excitons

被引：175
作者：
Butov, LV
Ivanov, AL
Imamoglu, A
Littlewood, PB
Shashkin, AA
Dolgopolov, VT
Campman, KL
Gossard, AC
机构：
[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
[2] Cardiff Univ, Dept Phys & Astron, Cardiff CF24 3YB, S Glam, Wales
[3] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA
[4] Univ Cambridge, Cavendish Lab, Dept Phys, TCM, Cambridge CB3 0HE, England
[5] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 24期
关键词：
D O I：
10.1103/PhysRevLett.86.5608
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We observe and analyze strongly nonlinear photoluminescence kinetics of indirect excitons in GaAs/AlGaAs coupled quantum wells at low bath temperatures, greater than or equal to 50 mK. The long recombination lifetime of indirect excitons promotes accumulation of these Bose particles in the lowest energy states and allows the photoexcited excitons to cool down to temperatures when the: dilute 2D gas of indirect excitons becomes statistically degenerate. Our main result-a strong enhancement of the exciton scattering rate to the low-energy states with increasing concentration of the indirect excitons-reveals bosonic stimulation of exciton scattering, which is a signature of a degenerate Bose-gas of excitons.
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页码：5608 / 5611
页数：4
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