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Title :Wavelength modulated absorption spectra of Cu2O thin films sandwiched by MgO plates
Authors :Iwamitsu, Kazunori
Aihara, Shingo
Ota, Akinobu
Yoshizaki, Yusuke
Shimamoto, Tomoshige
Fujii, Atsuhiro
Akai, Ichiro
Issue Date :2012
Citation jtitle :Physics Reports of Kumamoto University
vol. :14
no. :1
start page :41
end page :51
Abstract :We investigated temperature dependence of wavelength modulated (WM) absorption spectra for studying stress effects on a Cu2O thin film. In these spectra, 2P∼4P spectral structures can be clearly detected in both yellow and green excitons even at 180 K. From temperature dependences of these resonance energy, one can find that, because of a difference in the thermal variation of the lattice constant between Cu2O and MgO, the band gap energies of these excitons systems in the thin film vary in different behaviors from those in Cu2O bulk crystals. By comparing our experimental results and Trebin’s model, it is understood that this difference is caused by a symmetrical difference of the valence bands between the yellow (Γ+ 7 ) and green (Γ+ 8 ) exciton systems in Cu2O.
Type Local :紀要論文
ISSN :03034070
Publisher :熊本大学
URI :http://hdl.handle.net/2298/26166
Appears in Collections:Bulletin Paper (Science)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2298/26166