Bayesian Analysis of an Excitonic Absorption Spectrum in a Cu^sub 2^O Thin Film Sandwiched by Paired MgO Plates
We analyzed the absorption spectrum of a Cu^sub 2^O thin film sandwiched by paired MgO plates with the Metropolis algorithm of Bayesian estimation to estimate the energy shift of a yellow excitonic band gap. In the absorption spectrum, discrete excitonic resonant transitions with homogeneous and inh...
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Veröffentlicht in: | Journal of the Physical Society of Japan 2016-09, Vol.85 (9), p.1 |
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Sprache: | eng |
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Zusammenfassung: | We analyzed the absorption spectrum of a Cu^sub 2^O thin film sandwiched by paired MgO plates with the Metropolis algorithm of Bayesian estimation to estimate the energy shift of a yellow excitonic band gap. In the absorption spectrum, discrete excitonic resonant transitions with homogeneous and inhomogeneous widths are superimposed upon the tail parts of excitonic continuum and band-to-band absorption bands. On the basis of the Metropolis samplings with 2.5 million steps after sufficient burn-in steps, the spectral parameters of the excitonic resonant transitions can be estimated satisfactorily with a high degree of accuracy. In particular, we demonstrated that the yellow excitonic band gap in the Cu^sub 2^O thin film shifts to the lower energy side than that of Cu^sub 2^O bulk crystals. This result is consistent with the stress relaxation model for such Cu^sub 2^O thin films, which was reported in Eur. Phys. J. B 86, 194 (2013). |
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ISSN: | 0031-9015 1347-4073 |