Type-I and Type-II Confinement in Quantum Dots: Excitonic Fine Structure
| Authors | |
|---|---|
| Year of publication | 2016 |
| Type | Article in Periodical |
| Magazine / Source | ACTA PHYSICA POLONICA A |
| MU Faculty or unit | |
| 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. |
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