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Title :Bayesian spectroscopy on polarization dependent photoluminescence spectra of doubly-split excitons in a Cu2O thin-crystal sandwiched by MgO substrates
Authors :Kiridoshi, Arisa
Aihara, Shingo
Arishima, Syunshiro
Yamashiro, Tetsuya
Mizumaki, Masaichiro
Iwamitsu, Kazunori
Akai, Ichiro
Issue Date :19-Jul-2018
Citation jtitle :physica status solidi B
vol. :255
no. :11
start page :1800136-1
end page :1800136-9
Abstract :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.
URL :https://onlinelibrary.wiley.com/doi/abs/10.1002/pssb.201800136
Type Local :プレプリント
ISSN :03701972
Publisher :Wiley
Rights :© 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
URI :http://hdl.handle.net/2298/43201
Appears in Collections:Journal Article (Sciende)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2298/43201