Atomic Structures of GaN(0001) Reconstructed Surfaces

—Approach Using First-Principles Simulation and STM Measurement—

Abstract

Atomic structures of Ga-polar GaN(0001) reconstructed surfaces have been investigated by using first-principles total energy calculations as well as scanning tunneling microscopy measurements. It is found that the 2×2, 4×4, and 5×5 reconstructed structures of Ga-polar GaN(0001) surfaces consist of Ga adatoms adsorbed on the Ga-terminated surface bilayer.