一般注記type:プレプリント
By using Bayesian spectroscopy, we studied polarization dependence of photoluminescence (PL) spectra in doubly-split 1S yellow ortho-excitons in a Cu2O thin-crystal recrystallized in a small gap between paired MgO substrates. In these thin-crystals, biaxial stresses are expected to be involved due to a small lattice mismatch between Cu2O and MgO. The ortho-exciton state splits into two states due to symmetry lowering. To elucidate such biaxial stress effect, we measured polarization dependence of the PL spectra. Although resonant weak PL bands of the doubly-split exciton states and their intense phonon sidebands co-exist, we succeeded in decomposing to the respective spectral components by the Bayesian spectroscopy. As a result, it was found that the resonant PL band appearing on higher energy side shows hardly polarization dependence, whereas the resonant PL band at lower energy side is further weak and shows polarization dependence. These results can be explained by the selection rule and polarization dependences on the transition matrix elements of quadrupole transitions of the ortho-exciton states, and it clearly shows that the crystal symmetry degrades to tetragonal one by the isotropic biaxial stress involved in the Cu2O thin-crystals.
identifier:https://onlinelibrary.wiley.com/doi/abs/10.1002/pssb.201800136
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連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）