Type-I and Type-II Confinement in Quantum Dots: Excitonic Fine Structure

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Authors	KŘÁPEK Vlastimil KLENOVSKÝ Petr ŠIKOLA Tomáš
Year of publication	2016
Type	Article in Periodical
Magazine / Source	ACTA PHYSICA POLONICA A
MU Faculty or unit	Central European Institute of Technology
Citation
Web	http://przyrbwn.icm.edu.pl/APP/PDF/129/a129z1ap13.pdf
Doi	http://dx.doi.org/10.12693/APhysPolA.129.A-66
Field	Solid matter physics and magnetism
Keywords	quantum dots; type-II bandalignment; excitonic fine structure; theory
Description	e have theoretically studied type-I and type-II confinement in InAs quantum dots with GaAsSb capping layer. The character of the confinement can be adjusted by the Sb content. We have found that upon the transition from type-I to type-II confinement the hole wave functions change the topology from a compact shape to a two-segment shape, resulting in the complex changes in the exciton fine structure splitting with zero values at particular compositions. Additionally, a high exciton radiative recombination probability is preserved even in type-II. This allows to design strongly luminescent quantum dots with naturally low fine structure splitting, which could serve as sources of entangled photon pairs for quantum communication.
Related projects:	CEITEC - Central European Institute of Technology Support of Excellence Research Teams in the Field of Nanotechnologies and Microtechnologies Struktura, elektronová struktura a optická odezva pokročilých materiálů IV