DocumentCode :
1814968
Title :
Spin relaxation in InAs quantum dots probed by transient nonlinear optical spectroscopy
Author :
Lenihan, A.S. ; Dutt, M.V.G. ; Steel, D.G. ; Ghosh, S. ; Bhattacharya, P.K.
Author_Institution :
Harrison M. Randall Lab. of Phys., Michigan Univ., Ann Arbor, MI, USA
fYear :
2001
fDate :
11-11 May 2001
Firstpage :
5
Lastpage :
6
Abstract :
Summary form only given. Transient nonlinear optical spectroscopy has been a powerful tool for the study of fundamental processes in semiconductor systems. We use transient differential transmission (DT) to study the spin relaxation of excitons in the ground state of an ensemble of InAs self-assembled quantum dots. The sample investigated consisted of a single layer of InAs quantum dots, grown in the Stranski-Krastenow mode. Cross-sectional STM measurements confirmed the quality of the dots following post-growth rapid thermal annealing. The use of circular polarizations allows for the direct study of spin-related processes of the dot ground state. Because the DT measurements are performed resonantly, there is no complication due to excited state relaxation, unlike the case of PL measurements.
Keywords :
III-V semiconductors; electron spin polarisation; excitons; ground states; indium compounds; light transmission; nonlinear optics; scanning tunnelling microscopy; self-assembly; semiconductor quantum dots; InAs; InAs quantum dots; InAs self-assembled quantum dot ensemble; Stranski-Krastenow mode; circular polarizations; cross-sectional STM measurements; excited state relaxation; exciton spin relaxation; ground state; post-growth rapid thermal annealing; semiconductor systems; spin-related processes; transient differential transmission; transient nonlinear optical spectroscopy; Excitons; Nonlinear optics; Performance evaluation; Polarization; Quantum dots; Rapid thermal annealing; Rapid thermal processing; Resonance; Spectroscopy; Stationary state;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-663-X
Type :
conf
DOI :
10.1109/QELS.2001.961773
Filename :
961773
Link To Document :
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