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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1406.0685cond-mat.mtrl-sci
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从\textit{ab initio}计算得到的\ce{Mg(OH)2}和\ce{Ca(OH)2}中的激子

Excitons in \ce{Mg(OH)2} and \ce{Ca(OH)2} from \textit{ab initio} calculations

A. Pishtshev, S. Zh. Karazhanov, M. Klopov

摘要:

通过使用\textit{ab initio}计算与HSE 06混合功能和GW近似结合的Bethe Salpeter方程(GW-BSE)的数值解,我们预测的多功能氢氧化物\ce{\textit{X}(OH)2}(\textit{X} = Mg和Ca),以前没有报道的实验或理论上的存在不同数量的激子状态。介电函数的虚部和反射率谱显示出非常强的峰,对应于大结合能的电子-空穴对态。激子的起源归因于与氧$2p_x, 2p_y$占据态以及氧和土金属$s$空态相关的空穴和电子的强局部化。研究结果对该类材料在光电子器件中的不同应用具有重要意义。

英文摘要:

By using \textit{ab initio} calculations with the HSE06 hybrid functional and GW approximation combined with numerical solution of the Bethe Salpeter equation (GW-BSE) we predict the existence of diverse number of excitonic states in multifunctional hydroxides \ce{\textit{X}(OH)2} (\textit{X}= Mg and Ca) that were not previously reported experimentally or theoretically. Imaginary part of the dielectric function and reflectivity spectra show very strong peaks corresponding to the electron-hole pair states of large binding energy. The origin of the excitons is attributed to strong localization of the hole and electron associated to oxygen $2p_x, 2p_y$ occupied states as well as to oxygen and earth metal $s$ empty states, respectively. The results have important implications for different applications of the materials in optoelectronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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