Wavelength modulated excitonic spectra of Cu 2 O thin films sandwiched by MgO plates

Kazunori Iwamitsu (), Shingo Aihara, Tomoshige Shimamoto, Atsuhiro Fujii and Ichiro Akai

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 5, 1-6

Abstract: We have investigated stress effects on yellow exciton states in a Cu 2 O 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 Cu 2 O 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 Cu 2 O thin film sandwiched by MgO plates. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30595-4

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