Structural Dependency of the Optical Properties of Coupled GaAs Quantum Qots and Rings

Title
Structural Dependency of the Optical Properties of Coupled GaAs Quantum Qots and Rings
Authors
Sang Jo LeeJong Su KimClare C. ByeonHoonsoo KangMun Seok Jeong송진동Jae-Young LeemKoo-Chul JeSang Jun LeeSam Kyu Noh
Keywords
droplet; GaAs; quantum dots; Coupled quantum dots; Concentric quantum-double rings; Optical properties; Structural properties
Issue Date
2012-08
Publisher
Journal of the Korean Physical Society
Citation
VOL 61, NO 3, 455-459
Abstract
By using droplet epitaxy, we fabricated asymmetrically-coupled GaAs quantum dot molecules (AQDMs) and symmetrically-coupled GaAs concentric quantum-double rings (SCQRs). The geometrical coupling distances, dot-to-dot for the AQDMs and ring-to-ring for the SCQRs, were 30 nm and 28 nm, respectively. The photoluminescence (PL) measurement was performed with a femtosecond laser as an excitation source to investigate the structure-dependent optical properties of the AQDMs and the SCQRs as functions of the excitation intensity (corresponding to the injection carrier density). The excitation-power-dependent PL showed that the emission peak of the AQDMs was systemically red-shifted with increasing excitation intensity while the emission peak of the SCQRs was blue-shifted. The anomalous behavior in the shift of the emission peak for the AQDMs can be explained by using the inhomogeneous carrier distribution due to the geometrical asymmetry of the coupled QDs.
URI
http://pubs.kist.re.kr/handle/201004/43960
ISSN
03744884
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KIST Publication > Article
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