Wavelength modulated excitonic spectra of Cu2O thin films sandwiched by MgO plates

  • Kazunori Iwamitsu
  • Shingo Aihara
  • Tomoshige Shimamoto
  • Atsuhiro Fujii
  • Ichiro Akai
Regular Article
Part of the following topical collections:
  1. Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials

Abstract

We have investigated stress effects on yellow exciton states in a Cu2O thin film sandwiched by MgO plates by measuring wavelength modulated (WM) absorption spectra and their thermal variations. In the WM absorption spectra, dispersive spectral structures owing to 2P~4P states in the yellow excitons are clearly resolved in the thin film sample. A stress due to the lattice mismatch between Cu2O and MgO provides a large red shift of the band gap in the green excitonic system. However, in the yellow excitonic transitions, it is found that a red-shift of the 2P excitonic state is much smaller than that in the green excitonic system. This result suggests that a shallow potential minimum for the yellow excitons is built up in the Cu2O thin film sandwiched by MgO plates.

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Kazunori Iwamitsu
    • 1
  • Shingo Aihara
    • 1
  • Tomoshige Shimamoto
    • 2
  • Atsuhiro Fujii
    • 2
  • Ichiro Akai
    • 2
  1. 1.Graduate School of Science and TechnologyKumamoto UniversityKumamotoJapan
  2. 2.Shockwave and Condensed Matter Research CenterKumamoto UniversityKumamotoJapan

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