Unique Dynamic Appearance of a Ge-Si Ad-dimer on Si(001)
Journal Article
·
· Physical Review Letters
We carry out a comparative study of the energetics and dynamics of Si-Si, Ge-Ge, and Ge-Si ad-dimers on top of a dimer row in the Si(001) surface, using first-principles calculations. The dynamic appearance of a Ge-Si dimer is distinctively different from that of a Si-Si or Ge-Ge dimer, providing a unique way for its identification by scanning tunneling microscopy (STM). Its ''rocking'' motion, observed in STM, actually reflects a 180{sup o} rotation of the dimer, involving a piecewise-rotation mechanism. The calculated energy barrier of 0.74eV is in good agreement with the experimental value of 0.82eV.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205940
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 85; ISSN 0031-9007
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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