Abstract
Reconstructions of the surface are studied for the first time. Using scanning tunneling microscopy and reflection high-energy electron diffraction, four primary structures are observed: , and . On the basis of first-principles calculations, the structure is shown to consist of a Ga monolayer bonded to a N-terminated GaN bilayer. From a combination of experiment and theory, it is argued that the structure is an adatom-on-adlayer structure with one additional Ga atom per unit cell.
- Received 20 June 1997
DOI:https://doi.org/10.1103/PhysRevLett.79.3934
©1997 American Physical Society