Browsing by Author "Huang, Shan-Yu"

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Electron-hole symmetry breakings in optical fine structures of single self-assembled quantum dots
(2010-02-01)
Ramirez, Hanz Y.
;
Lin, Chia-Hsien
;
You, Wen Ting
;
Huang, Shan-Yu
;
Chang, Wen-Hao
The effects of electron-hole (e-h) symmetry breaking on the optical fine structure splitting (FSS) of single excitons in individual InGaAs/GaAs self-assembled quantum dots are experimentally and theoretically studied. The measured FSSs of small InGaAs/GaAs self-assembled quantum dots show a monotonic decrease wills increasing emission energy and eventually almost vanish (<= 10 mu eV) in the high energy regime. A theory based on 3D asymmetric parabolic model for e-h exchange interaction in combination with 3D finite difference simulations for Ga-diffused InGaAs/GaAs QDs is developed to explore the underlying physics. The reduced FSSs in the high emission energy regime are shown closely related to the e-h wave function symmetry breaking which is especially significant in highly Ga-diffused quantum dots. The Ga-diffusion induced e-h asymmetry reduces the e-h wave function overlap and results in the feature of reduced fine energy splitting. (c) 2009 Elsevier Boy. All rights reserved.
Electron-hole symmetry breakings in optical fine structures of single self-assembled quantum dots (vol 42, pg 1155, 2010)
(2010-11-01)
Ramirez, Hanz Y.
;
Lin, Chia-Hsien
;
You, Wen Ting
;
Huang, Shan-Yu
;
Chang, Wen-Hao
Electron-hole symmetry breakings in optical fine structures of single self-assembled quantum dots (vol 42, pg 1155, 2010)
(2010-11-01)
Ramirez, Hanz Y.
;
Lin, Chia-Hsien
;
You, Wen Ting
;
Huang, Shan-Yu
;
Chang, Wen-Hao