Spin relaxation in InAs columnar quantum dots

T. Umi, H. Nosho, S. Lu, Lianhe Li, A. Fiore, A. Tackeuchi

Research output: Contribution to journalArticleAcademicpeer-review


We have investigated carrier spin dynamics in InAs columnar quantum dots (CQDs) by time-resolved photoluminescence (PL) measurement. The CQDs were formed by depositing a 1.8 monolayer InAs seed dot layer and a short-period GaAs/InAs superlattice (SL). The spin relaxation time was found to be prolonged from 1.6 to 5.3 ns by increasing the number of SL periods from 3 to 35. The PL decay time also increased from 0.93 to 1.9 ns, indicating a decrease in the spatial overlap of electron and hole wave functions. The changes in both the spin relaxation time and the PL decay time suggest that the Bir-Aronov-Pikus process is the main spin relaxation mechanism. © 2009 The Japan Society of Applied Physics. U7 - Export Date: 2 August 2010 U7 - Source: Scopus U7 - Art. No.: 04C199
Original languageEnglish
Article number04C199
Pages (from-to)04C199-1/3
Number of pages3
JournalJournal of Applied Physics
Issue number4-2
Publication statusPublished - 2009


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