Dynamics of the in-plane charge separation front in a two-dimensional electron-hole gas

被引：12
|
作者：
Chen, G [1 ]
Rapaport, R [1 ]
Simon, SH [1 ]
Pfeiffer, L [1 ]
West, K [1 ]
机构：
[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 04期
关键词：
D O I：
10.1103/PhysRevB.71.041301
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We show both experimentally and theoretically that the recently observed optically induced in-plane charge separation in quantum well (QW) structures and the exciton ring emission pattern at this charge separation boundary have an extremely long lifetime. The oppositely charged carriers remain separated and provide a reservoir of excitons at their boundary with a persistent emission which lasts hundreds of microseconds (orders of magnitude longer than their recombination time) after the external excitation is removed. This long lifetime is due to an interplay between the slow in-plane carrier diffusion and slow carrier tunneling perpendicular to the QW plane.
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页数：4
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