In the present work the clean Ge(001)-(2×1) surface is studied with scanning tunneling microscopy. Many different dimer-vacancy (DV) defects and complexes are seen on the surface. Among them the complex consisting of a missing dimer, a twin missing-dimer, and a dimer between them, i.e., the (1+2)-DV complex, comprises a great majority. Our line scan of the (1+2)-DV complex strongly supports the structural model proposed recently by Wang, Arias, and Joannopoulos for the (1+2)-DV complex on the Si(001) surface. In addition, some information on the interactions between neighboring dimers are also obtained and discussed, and some differences between Ge(001) and Si(001) surfaces are noted.
ASJC Scopus subject areas
- Condensed Matter Physics