Kinetics of the inner ring in the exciton emission pattern in coupled GaAs quantum wells
Kinetics of the inner ring in the exciton emission pattern in coupled GaAs quantum wells
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DOI：
10.1103/physrevb.80.155331
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发表时间：
2009-10-01
影响因子：
3.7
通讯作者：
Gossard, A. C.
中科院分区：
文献类型：
--
作者：
Hammack, A. T.;Butov, L. V.;Gossard, A. C.
我们报告的激子发射模式的内环的动力学。发现在激光激发开始之后的内环的形成时间为约30 ns。内环也被发现在激光终止后的4 ns内消失。后一个过程伴随着光致发光（PL）强度的跳跃。PL跳跃的空间依赖性表明，即使在激光激发期间，激光激发区域（包括内环区域）之外的激子也被有效地冷却至晶格温度。环的形成和消失的激子运输和冷却方面的解释。
We report on the kinetics of the inner ring in the exciton emission pattern. The formation time of the inner ring following the onset of the laser excitation is found to be about 30 ns. The inner ring is also found to disappear within 4 ns after the laser termination. The latter process is accompanied by a jump in the photoluminescence (PL) intensity. The spatial dependence of the PL jump indicates that the excitons outside of the region of laser excitation, including the inner ring region, are efficiently cooled to the lattice temperature even during the laser excitation. The ring formation and disappearance are explained in terms of exciton transport and cooling.