Exciton-Phonon Coupling in Single Band-Gap Engineered ZnCdSe-Dot/CdS-Rod Nanocrystals

Autor:	Johst, Florian, Rebmann, Jannik, Werners, Hans, Klemeyer, Lars, Kesavan, Jagadesh Kopula, Koziej, Dorota, Strelow, Christian, Bester, Gabriel, Mews, Alf, Kipp, Tobias
Rok vydání:	2024
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science Physics - Chemical Physics
Druh dokumentu:	Working Paper
Popis:	Exciton-phonon coupling limits the homogeneous emission linewidth of nanocrystals. Hence, a full understanding of it is crucial. In this work, we statistically investigate exciton-phonon coupling by performing single-particle spectroscopy on Zn$_{1-x}$Cd$_{x}$Se/CdS dot-in-rod nanocrystals at cryogenic temperatures ($T\approx 10~\rm{K}$). In situ cation exchange enables us to analyze different band alignments and thereby different charge-carrier distributions. We find that the relative intensities of the longitudinal optical S- and Se-type phonon replicas correlate with the charge-carrier distribution. Our experimental findings are complemented with quantum mechanical calculations within the effective mass approximation that hint at the relevance of surface charges. Comment: 21 pages, 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2404.11516 Zobrazit plný text záznamu View this record from Arxiv