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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Surface phonon dispersion of the deuterium-terminated Si(111)-(1 X 1) surface
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Surface phonon dispersion of the deuterium-terminated Si(111)-(1 X 1) surface

机译：氘终止的Si（111）-（1 X 1）表面的表面声子色散

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摘要

The surface phonon dispersion was investigated by high-resolution electron-energy-loss spectroscopy on the deuterium-terminated Si(111)-(1 X 1) prepared by an improved wet chemical method. The phonon modes were recorded over the entire surface Brillouin zone and compared with the theoretical phonon dispersion curves derived on the basis of semiempirical total-energy scheme calculated by Sandfort et al. [Phys. Rev. B 51, 7139 (1995)] and by Graeschus et al. [Surf. Sci. 368, 179 (1996)]. The present results of the observation fairly agree with the theoretical curves, except a discrepancy for B_3 and R_1 branches exhibiting a sizable dispersion between 35 and 55 meV, which was predicted to have no dispersion by the theory. The suface-projected bulk phonon is distributed below 65 meV of the vibration energy, and the Si-D modes with higher energies than that are independent of SPBP. The Si-D vibrations with energies between 35 and 65 meV strongly intermix with bulk phonons, and below 35 meV, the Si-D's move together in phase and the surface phonons are the same as those of hydrogen-terminated Si(111)-(1 X 1).
机译：通过改进的湿化学方法制备的氘封端的Si（111）-（1 X 1），通过高分辨率电子能量损失谱研究了表面声子的色散。声子模式记录在整个布里渊区上，并与根据Sandfort等人计算的半经验总能量方案得出的理论声子色散曲线进行比较。 [物理Rev.B 51，7139（1995）]和Graeschus等人。 [冲浪。科学368，179（1996）]。观测的当前结果与理论曲线完全吻合，除了B_3和R_1分支的差异显示在35和55 meV之间有相当大的分散，理论上没有预期的分散。表面投射的体声子的分布低于振动能的65 meV，并且Si-D模具有比SPBP高的能量。能量在35和65 meV之间的Si-D振动与体声子强烈混合，而在35 meV以下，Si-D的同相运动和表面声子与氢封端的Si（111）-（ 1 X 1）。

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