2021/12/10 by Petr Klenovský, Jakub Valdhans, Klenovský, Petr +9
Engineering · Materials Science · #Chalcogenide Semiconductor Thin Films #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Near-Field Optical Microscopy #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.2112.05602
openalex publication_date 2021/12/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the effect of Coulomb correlation on the emission properties of the\nground state exciton in zincblende CdSe/ZnS core-shell and in wurtzite ZnO\nquantum dots. We validate our theory model by comparing results of computed\nexciton energies of CdSe/ZnS quantum dots to photoluminescence and scanning\nnear-field optical microscopy measurements. We use that to estimate the\ndiameter of the quantum dots using a simple model based on infinitely deep\nquantum well and compare the results with the statistics of the atomic force\nmicroscopy scans of CdSe/ZnS dots, obtaining excellent agreement. Thereafter,\nwe compute the energy fine structure of exciton, finding striking difference\nbetween properties of zincblende CdSe/ZnS and wurtzite ZnO dots. While in the\nformer the fine structure is dominated by the dipole terms of the multipole\nexpansion of the exchange interaction, in the latter system that is mostly\ninfluenced by Coulomb correlation. Furthermore, the correlation sizeably\ninfluences also the exciton binding energy and emission radiative rate in~ZnO\ndots.\n