Interplay between multipole expansion of exchange interaction and Coulomb correlation of exciton in colloidal II-VI quantum dots

被引：7

作者：

Klenovsky, Petr ^{[1
,2
]}

Valdhans, Jakub ^{[1
]}

Krejci, Lucie ^{[1
]}

Valtr, Miroslav ^{[2
,3
]}

Klapetek, Petr ^{[2
,3
]}

Fedotova, Olga ^{[4
]}

机构：

[1] Masaryk Univ, Fac Sci, Dept Condensed Matter Phys, Kotlarska 267-2, Brno 61137, Czech Republic

[2] Czech Metrol Inst, Okruzni 31, Brno 63800, Czech Republic

[3] Brno Univ Technol, CEITEC, Purkynova 123, Brno 61200, Czech Republic

[4] Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, P Brovki Str 19, Minsk 220072, BELARUS

来源：

ELECTRONIC STRUCTURE | 2022年 / 4卷 / 01期

关键词：

quantum dot; colloidal; multiparticle states; configuration interaction; correlation; AFM; SNOM; FINE-STRUCTURE; EMISSION; LASER; CHIP;

D O I：

10.1088/2516-1075/ac5b7e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We study the effect of Coulomb correlation on the emission properties of the ground state exciton in zincblende CdSe/ZnS core-shell and in wurtzite ZnO quantum dots (QDs). We validate our theory model by comparing results of computed exciton energies of CdSe/ZnS QDs to photoluminescence and scanning near-field optical microscopy measurements. We use that to estimate the diameter of the QDs using a simple model based on infinitely deep quantum well and compare the results with the statistics of the atomic force microscopy scans of CdSe/ZnS dots, obtaining excellent agreement. Thereafter, we compute the energy fine structure of exciton, finding striking difference between properties of zincblende CdSe/ZnS and wurtzite ZnO dots. While in the former the fine structure is dominated by the dipole terms of the multipole expansion of the exchange interaction, in the latter system that is mostly influenced by Coulomb correlation. Furthermore, the correlation sizeably influences also the exciton binding energy and emission radiative rate in ZnO dots.

引用

页数：12