Nonlinear Photoluminescence Kinetics of Indirect Excitons in Coupled Quantum Wells

✍ Scribed by Butov, L.V. ;Imamoglu, A. ;Shashkin, A.A. ;Dolgopolov, V.T. ;Mintsev, A.V. ;Feklisov, S.G. ;Campman, K.L. ;Gossard, A.C.

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 188 KB
• Volume: 178
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200003)178:1<83::aid-pssa83>3.0.co;2-8

✦ Synopsis

We report the strongly nonlinear dependence of indirect exciton photoluminescence (PL) kinetics on excitation density. In the indirect regime characterized by a slow exciton recombination, at high excitation densities, low magnetic fields, low temperatures, and for samples with small in-plane disorder, we observe that the indirect exciton PL intensity increases sharply within a few nanoseconds after the excitation is switched off. This PL intensity jump is also accompanied by a subsequent PL decay rate that increases with excitation density. The effects are observed only when the estimated occupancies of the lowest energy exciton states exceed unity.