SHEAR HORIZONTAL VIBRATIONS AT THE (0001) SURFACE OF BERYLLIUM

被引：18
作者：
HANNON, JB
PLUMMER, EW
机构：
[1] UNIV PENN,PHILADELPHIA,PA 19104
[2] UNIV TENNESSEE,KNOXVILLE,TN 37996
来源：
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 1993年 / 64-5卷
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/0368-2048(93)80137-B
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
We report the results of a high-resolution Electron-Energy Loss Spectroscopy (EELS) investigation of the Be(0001) surface. Two dispersive surface vibrational modes are observed in the ($) over bar T to ($) over bar M direction: a sagittal-plane mode (the Rayleigh wave) and a shear horizontal mode. We have compared our experimental results to a 300-layer slab calculation and to a semi-infinite Green's function calculation of Sameth and Mele. Both calculations predict a higher energy for the Rayleigh wave and lower energy for the shear horizontal mode than is experimentally measured. These results are consistent with stronger in-plane bonding and weaker interplanar bonding at the surface, in accord with other theoretical predictions.
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收藏
页码：683 / 690
页数：8
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