Title: Mechanically encoded single-photon sources: Stress-controlled excitonic fine structures of droplet epitaxial quantum dots
Authors: Cheng, Shun-Jen
Liao, Yu-Huai
Lin, Pei-Yi
Department of Electrophysics
Issue Date: 20-Mar-2015
Abstract: 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
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.91.115310
Volume: 91
Issue: 11
Appears in Collections:Articles