Ultrafast dynamics of excitons in delafossite CuScO2 thin films

Fucai Liu, T. Makino, H. Hiraga, T. Fukumura, Yongfa Kong, M. Kawasaki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Ultrafast carrier dynamics were investigated in a delafossite CuScO 2, a material with a remarkably large binding energy of exciton (∼0.4 eV), using femtosecond transient transmission spectroscopy. Differential transmission spectra showed dispersive structures in the excitonic resonance energies. We have observed a delayed rise-up on a time scale of 10 ps, suggesting slow carrier cooling. It is followed by a slower decay, time constant of which corresponds to the lifetime of exciton (approximately 0.75 ns). These results were analyzed in terms of the generalized many-body Elliott model, accounting for a screening effect of excitons.

Original languageEnglish
Article number211904
JournalApplied Physics Letters
Volume96
Issue number21
DOIs
Publication statusPublished - 2010 May 24

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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