標題: Mechanically encoded single-photon sources: Stress-controlled excitonic fine structures of droplet epitaxial quantum dots
作者: Cheng, Shun-Jen
Liao, Yu-Huai
Lin, Pei-Yi
電子物理學系
Department of Electrophysics
公開日期: 20-三月-2015
摘要: We present numerical investigations based on the Luttinger-Kohn four-band k . p theory and, accordingly, establish a quantitatively valid model of the excitonic fine structures of droplet epitaxial GaAs/AlGaAs quantum dots under uniaxial stress control. In the formalisms, stressing a photoexcited quantum dot is equivalent creating a pseudomagnetic field that is directly coupled to the pseudospin of the exciton doublet and tunable to tailor the polarized fine structure of exciton. The latter feature is associated with the valence-band mixing of exciton, which is especially sensitive to external stress in inherently unstrained droplet epitaxial GaAs/AlGaAs quantum dots and allows us to mechanically design and prepare any desired exciton states of QD photon sources prior to the photon generation.
URI: http://dx.doi.org/10.1103/PhysRevB.91.115310
http://hdl.handle.net/11536/124500
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.91.115310
期刊: PHYSICAL REVIEW B
Volume: 91
Issue: 11
顯示於類別:期刊論文