Generation processes of superfluorescence of biexcitons in CuCl quantum dots by one- and two-photon resonant excitation. (May 2019)

• Record Type: Journal Article
• Authors: Kawamura, K; Yoshida, T; Nasu, M; Ishihara, J; Ishikawa, A; Miyajima, K
• Is Part Of: Journal of physics. Volume 1220(2019)
• Publication Date: 2019-05
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1220/1/012020
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: We investigated the influence of excitation processes of a biexciton on the generation of superfluorescence, which is pulsed radiation from coherently coupled two-level systems, from biexcitons in CuCl quantum dots. Two excitation processes of biexcitons were examined: resonant two-photon excitation of biexcitons, and resonant one-photon excitation of excitons. The excitation density dependence of the time-resolved photoluminescence was measured. The results showed that for one-photon excitation, a stronger peak intensity, longer delay time and wider pulse width were observed compared to resonant two-photon excitation. The high density of the excited dots in the one-photon excitation process results in the strong pulse, while an initial population of excitons results in a suppression of coherent coupling.