Experimental surface-state band structure of the Ba-induced Si ( 111 ) 3 × 1 surface
Experimental surface-state band structure of the Ba-induced Si ( 111 ) 3 × 1 surface
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Ba诱导Si(111)3×1表面的实验表面态能带结构
DOI：
10.1103/physrevb.64.165312
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发表时间：
2001
影响因子：
3.7
通讯作者：
T. Kinoshita
中科院分区：
文献类型：
--
作者：
T. Okuda;H. Ashima;H. Takeda;K. An;A. Harasawa;T. Kinoshita
通过使用同步辐射的角分辨光电子能谱，详细研究了 Ba 诱导的单畴 $\mathrm{Si}(111)3\ifmmode\times\else\texttimes\fi{}1$ 表面的表面能带结构。应用不同的光子能量和实验几何结构，我们获得了实验表面态能带结构，包括表面态对称性信息。我们的结果表明，与之前能带计算的预测相反，表面电子态无疑是半导体。然而，三种非金属表面态的色散特征与蜂窝链通道模型的计算结果几乎完全一致。我们的结果与理论计算之间的不一致可以通过碱土金属的覆盖度与碱金属的覆盖度不同来解释。相反，碱土金属在 $3\ifmmode\times\else\texttimes\fi{}1$ 表面上的覆盖率是碱金属的一半，即 1/6 单层。
The surface-state band structure of the Ba-induced single-domain $\mathrm{Si}(111)3\ifmmode\times\else\texttimes\fi{}1$ surface was studied in detail via angle-resolved photoelectron spectroscopy using synchrotron radiation. Applying different photon energies and experimental geometries, we obtained the experimental surface-state band structure, including information of the symmetry of the surface states. Our results indicate that the surface electronic state is undoubtedly semiconducting, in contrast to the prediction of previous band calculations. However, the dispersion feature of the three nonmetallic surface states is in almost perfect agreement with that calculated for the honeycomb-chained channel model. The inconsistency between our results and the theoretical calculation can be explained by the fact that the coverage of alkali-earth metal is not the same as that of alkali metal. Rather, the coverage of alkali-earth metal on the $3\ifmmode\times\else\texttimes\fi{}1$ surface is half that of alkali metal, i.e., 1/6 monolayer.