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Publication
Physical Review Letters
Paper
Direct Observation of Adsorbate-Induced Band-Gap States on GaAs(110)
Abstract
Normally unoccupied adsorbate-induced states within the GaAs band gap were studied by measurement of ultraviolet-photoemission spectra from pulsed-laser-excited surfaces. Strikingly similar discrete structures within the gap were observed for submonolayer coverages of both chemisorbed oxygen and gold. The implications of these results for the understanding of Fermi-level pinning at interfaces are discussed. © 1986 The American Physical Society.