Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide

Tatsuya Kitamura, Mitsuyoshi Takahata, Nobuko Naka

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report the first observation of photoluminescence from excitonic Rydberg states with quantum number n up to 7 in Cu2O. We find that the luminescence linewidths increase at elevated temperatures and under increased laser power, and that the effect is more pronounced for a state with a larger n. The temperature dependence is attributed to scattering by longitudinal-optical phonons, whereas the density dependence is explained by the binary collisions of excitons in the ground (n=1) and excited (n≥2) Rydberg states. The n-dependent broadening is discussed on the basis of the overlap of wave functions and collision cross sections determined by the Bohr radius of Rydberg excitons.

Original languageEnglish
Pages (from-to)808-813
Number of pages6
JournalJournal of Luminescence
Volume192
DOIs
Publication statusPublished - 2017 Dec 1
Externally publishedYes

Keywords

  • Excitonic Rydberg states
  • Line broadening
  • Photoluminescence

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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