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タイトル :Wavelength modulated absorption spectra of Cu2O thin films sandwiched by MgO plates
著者 :Iwamitsu, Kazunori
Aihara, Shingo
Ota, Akinobu
Yoshizaki, Yusuke
Shimamoto, Tomoshige
Fujii, Atsuhiro
Akai, Ichiro
刊行年月日 :2012
収録雑誌名 :Physics Reports of Kumamoto University
巻 :14
号 :1
開始ページ :41
終了ページ :51
要約(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.
収録種別 :紀要論文
ISSN :03034070
出版社(者) :熊本大学
URI :http://hdl.handle.net/2298/26166
このアイテムの引用には次の識別子を使用してください: http://hdl.handle.net/2298/26166