Bayesian Analysis of an Excitonic Absorption Spectrum in a Cu2O Thin Film Sandwiched by Paired MgO Plates
Bayesian Analysis of an Excitonic Absorption Spectrum in a Cu2O Thin Film Sandwiched by Paired MgO Plates
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DOI：
10.7566/jpsj.85.094716
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发表时间：
2016-09-15
影响因子：
1.7
通讯作者：
Akai, Ichiro
中科院分区：
文献类型：
--
作者：
Iwamitsu, Kazunori;Aihara, Shingo;Akai, Ichiro
利用贝叶斯估计中的大都会算法分析了两块MgO板夹在中间的Cu2O薄膜的吸收光谱，估计了黄色激子带隙的能量移动.在吸收光谱中，具有均匀和不均匀宽度的离散激子共振跃迁叠加在激子连续谱和带间吸收带的尾部。在充分老化步骤后的250万步大都会采样的基础上，可以满意地估计激子共振跃迁的光谱参数，并具有较高的精度。特别是，我们证明了黄色激子的带隙在Cu2O薄膜转移到较低的能量侧比Cu2O块体晶体。这一结果与Eur. Phys. J. B 86，194（2013）。
We analyzed the absorption spectrum of a Cu2O 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 Cu2O thin film shifts to the lower energy side than that of Cu2O bulk crystals. This result is consistent with the stress relaxation model for such Cu2O thin films, which was reported in Eur. Phys. J. B 86, 194 (2013).