物理
能量(信号处理)
结晶学
带隙
硫系化合物
硫族元素
凝聚态物理
材料科学
量子力学
化学
光电子学
核物理学
作者
Kazushige Ueda,Hidenori Hiramatsu,Hiromichi Ohta,Masahiro Hirano,Toshio Kamiya,Hideo Hosono
标识
DOI:10.1103/physrevb.69.155305
摘要
$\mathrm{Ln}\mathrm{CuO}\mathrm{Ch}$ $(Ln=\mathrm{lanthanide},Ch=\mathrm{chalcogen})$ layered oxychalcogenides are wide-gap $p$-type semiconductors composed of alternately stacked ${(Ln}_{2}{\mathrm{O}}_{2}{)}^{2+}$ oxide layers and $({\mathrm{Cu}}_{2}{\mathrm{Ch}}_{2}{)}^{2\ensuremath{-}}$ chalcogenide layers. Energy band calculations revealed that $\mathrm{Cu}\ensuremath{-}Ch$ hybridized bands only spread in the $({\mathrm{Cu}}_{2}{\mathrm{Ch}}_{2}{)}^{2\ensuremath{-}}$ layers, which suggests that hole carriers in these bands are confined by the potential barriers formed by the ${(Ln}_{2}{\mathrm{O}}_{2}{)}^{2+}$ layers. Stepwise absorption spectra of a series of $\mathrm{Ln}\mathrm{CuO}\mathrm{Ch}$ experimentally verified that an exciton in the $({\mathrm{Cu}}_{2}{\mathrm{Ch}}_{2}{)}^{2\ensuremath{-}}$ layers shows a two-dimensional behavior. These theoretical and experimental results indicate that $\mathrm{Ln}\mathrm{CuO}\mathrm{Ch}$ has ``natural multiple quantum wells'' built into its layered structure.
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