Photoluminescence of tetrahedral quantum-dot quantum wells
V. A. Fonoberov (1), E. P. Pokatilov (2), V. M. Fomin (3), J. T., Devreese (3) ((1) Nano-Device Laboratory, University of California, USA, (2), FSM, Universitatea de Stat din Moldova, (3) TFVS, Universiteit Antwerpen,, Belgium)
TL;DR
This paper investigates how the tetrahedral shape of quantum-dot quantum wells affects their photoluminescence, revealing that shape influences exciton states and resulting optical properties.
Contribution
It provides a quantitative interpretation of the PL spectrum considering the tetrahedral geometry, highlighting shape-dependent excitonic behavior.
Findings
Exciton ground state in tetrahedral QDQW is bright.
Shape significantly affects exciton-phonon interactions.
Theoretical results match experimental PL spectra.
Abstract
Taking into account the tetrahedral shape of a quantum dot quantum well (QDQW) when describing excitonic states, phonon modes and the exciton-phonon interaction in the structure, we obtain within a non-adiabatic approach a quantitative interpretation of the photoluminescence (PL) spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast to the dark ground state for a spherical QDQW.
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