Exciton diffusion in a quantum dot ensemble

被引：0
|
作者：
Kawa, Karol [1 ]
Machnikowski, Pawel [1 ]
机构：
[1] Wroclaw Univ Sci & Technol, Inst Theoret Phys, PL-50370 Wroclaw, Poland
来源：
PHYSICAL REVIEW B | 2024年 / 109卷 / 22期
关键词：
Energy transfer - Equations of motion - Excitons - Nanocrystals - Semiconductor quantum dots - Stochastic models - Stochastic systems;
D O I：
10.1103/PhysRevB.109.224205
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this theoretical study, we explore F & ouml;rster resonant energy transfer of a single exciton within a twodimensional array of self-assembled quantum dots arranged randomly on a circular mesa. Employing the stochastic simulation method, we solve the equation of motion for the density matrix, considering a specified decay rate. Our analysis quantifies diffusion through the mean-square displacement from the initially excited quantum dot, revealing distinct temporal stages: ballistic, normal diffusion, and saturation. Furthermore, we observe power-law localization of the exciton. Complementing our numerical investigations, we develop approximate analytical expressions that closely align with the numerical findings.
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页数：10
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