Atomic structures of the (formula presented) surfaces have been studied using reflection high-energy electron diffraction (RHEED), scanning tunneling microscopy (STM), and first-principles total-energy calculations. STM observations have revealed that the (formula presented) surface exhibits large ordered regions having the Ga-vacancy buckling structure, while the (formula presented) surface consists of small domains, where the As trimers are adsorbed on the outermost As layer. The atomic coordinates for both surface structures have been determined by a rocking-curve analysis using RHEED. The obtained structure parameters are in good agreement with those obtained from first-principles calculations.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics