Abstract
The atomic structure and lattice dynamics of epitaxial BeTe(001) thin films are derived from surface x-ray diffraction and Raman spectroscopy. On the Te-rich BeTe(001) surface [1 (1) over bar0]-oriented Te dimers are identified. They cause a (2 X 1) superstructure and induce a pronounced buckling in the underlying Te layer. The Be-rich surface exhibits a (4 X 1) periodicity with alternating Te dimers and Te-Be-Te trimers. A vibration eigenfrequency of 165 cm(-1) is observed for the Te-rich surface, while eigenmodes at 157 and 188 cm(-1) are found for the Be-rich surface. The experimentally derived atomic geometry and the vibration modes are in very good agreement with the results of density functional theory calculations.
Original language | English |
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Journal | Physical Review B Condensed Matter |
Volume | 68 |
Issue number | 3 |
Pages (from-to) | 035339 |
Number of pages | 8 |
ISSN | 0163-1829 |
DOIs | |
Publication status | Published - 2003 |