標題: Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature
作者: Cheng, Chun
Lin, Sheng-Di
Pan, Chien-Hung
Lin, Chien-Hung
Fu, Ying-Jhe
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Quantum dot;Time-resolved photoluminescence;Spin-flip
公開日期: 26-三月-2012
摘要: We study the temperature-dependent time-resolved photoluminescence (TRPL) of self-assembled InAs quantum dots (QDs). Under low excitation power, a surprisingly long PL decay time is observed at about 60 K, under the thermal redistribution temperature. The long decay time decreases with increasing excitation power but is nearly independent of the detection energy of TRPL measurements. A model considering the spin relaxation through the excited excitonic state is proposed to quantitatively explain the unusual phenomena. The rate equation analysis indicates that the observation of long-lived excitons is caused by the shortened spin-flip time. (c) 2012 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11536/16111
ISSN: 0375-9601
期刊: PHYSICS LETTERS A
Volume: 376
Issue: 17
結束頁: 1495
顯示於類別:期刊論文


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