Phonon dispersion at the Be(0001) surface

被引:29
作者
Hannon, JB
Mele, EJ
Plummer, EW
机构
[1] UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104
[2] UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996
[3] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 04期
关键词
D O I
10.1103/PhysRevB.53.2090
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Measurements of surface-phonon dispersion at the Be(0001) surface are reported that are found to differ significantly from the predictions of an accurate model of the truncated bulk: the sign of the Rayleigh wave dispersion along the zone boundary is reversed in theory and experiment. The measured dispersion implies a reduction in the magnitude of noncentral forces at the surface. Such a reduction is compatible with the electronic structure of the Be(0001) surface, which is more free-electron-like than that of bulk Be due to a high density of surface states. We conclude that the properties of the surface states dominate the dynamics of surface atoms.
引用
收藏
页码:2090 / 2100
页数:11
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