Abstract
We present results of a comprehensive and systematic study of localized and resonance electron surface states for an unrelaxed as well as relaxed GaAs (110) zinc-blende surfaces by employing a first-principles full-potential self-consistent linear-muffin-tin orbital method and a supercell approach with the local density approximation of density functional theory. Intrinsic surface states appear in the fundamental energy gap for the unrelaxed surface atoms. These intrinsic surface states shift towards the bulk valence and conduction band region when the relaxation of the atoms in the vicinity of the surface are considered. Localized surface and resonance states are identified and are compared with the results of other calculations and the experimental data. The results are in very good agreement with the available angle-resolved photoemission (ARPE) and inverse photoemission data. Orbital characters of localized and resonance states have been investigated. Some new surface states around the symmetry point Γ have been predicted for the first time which are in reasonable agreement with the ARPE data.
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