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We investigated biaxial stress effects on the yellow 1S ortho excitons in Cu2O thin films recrystallized between paired MgO plates by measuring photoluminescence spectra, X-ray diffraction and polarization microscope images. On the MgO (001) surface, we found two kinds of epitaxial growth modes of the Cu2O thin films. In such thin films, the yellow 1S ortho exciton states split into two or three levels...
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