標題: Electron-hole symmetry breakings in optical fine structures of single self-assembled quantum dots
作者: Ramirez, Hanz Y.
Lin, Chia-Hsien
You, Wen Ting
Huang, Shan-Yu
Chang, Wen-Hao
Lin, Sheng-Di
Cheng, Shun-Jen
電子物理學系
Department of Electrophysics
關鍵字: Single quantum dots;Diffusion;Electron hole exchange;Spin excitons splitting
公開日期: 1-二月-2010
摘要: 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.
URI: http://dx.doi.org/10.1016/j.physe.2009.11.141
http://hdl.handle.net/11536/12567
ISSN: 1386-9477
DOI: 10.1016/j.physe.2009.11.141
期刊: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume: 42
Issue: 4
起始頁: 1155
結束頁: 1158
顯示於類別:會議論文


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