Shear horizontal vibrations at the (001) surface of beryllium
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Tennessee, Knoxville, TN (United States). Department of Physics and Astronomy
The authors report the results of a high-resolution Electron-Energy Loss Spectroscopy (EELS) investigation of Be(0001) surface. Two dispersive surface vibrational modes are observed in the {bar {Gamma}} to {bar M} direction: a sagittal-plane mode (the Rayleigh wave) and a shear horizontal mode. They have compared their experimental results to a 300-layer slab calculation and to a semi-infinite Green`s function calculation of Sameth and Mele. Compared with the experimental results, both calculations predict a higher energy for the Rayleigh wave and lower energy for the shear horizontal mode. These results are consistent with stronger in-plane bonding and weaker interplanar bonding at the surface, in accord with other theoretical predictions.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10182750
- Report Number(s):
- CONF-9306281-2; ON: DE94018675; TRN: 94:008374
- Resource Relation:
- Conference: 7. vibrations at surfaces,Santa Margherita (Italy),13-17 Jun 1993; Other Information: PBD: Jun 1993
- Country of Publication:
- United States
- Language:
- English
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