Wavelength modulated excitonic spectra of Cu2O thin films sandwiched by MgO platesKazunori Iwamitsu, Shingo Aihara, Tomoshige Shimamoto, Atsuhiro Fujii and Ichiro AkaiEur. Phys. J. B, 86 5 (2013) 194DOI: https://doi.org/10.1140/epjb/e2013-30595-4