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

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KŘÁPEK Vlastimil KLENOVSKÝ Petr ŠIKOLA Tomáš

Druh Článek v odborném periodiku
Časopis / Zdroj ACTA PHYSICA POLONICA A
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
WWW http://przyrbwn.icm.edu.pl/APP/PDF/129/a129z1ap13.pdf
Doi http://dx.doi.org/10.12693/APhysPolA.129.A-66
Obor Fyzika pevných látek a magnetismus
Klíčová slova quantum dots; type-II bandalignment; excitonic fine structure; theory
Popis 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.
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