About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Formation of metal/GaAs(110) interfaces studied by scanning tunneling microscopy
Abstract
Spectroscopic measurements with the scanning tunneling microscope (STM) for metal overlayers on the GaAs(110) surface are reviewed, including results for submonolayer Sb, Au, and Fe adsorbate systems. It is found that a characteristic spectrum of band gap states is present in each of these systems, induced by certain disorder-related structures on the surface. The observation of these gap states provides a phenomenological description of Fermi-level pinning on this surface. An extensive discussion is presented on the physical origin of the spectrum of gap states. The character of the states is considered, including possible contributions from evanescent (complex wavevector) semiconductor states, metal/semiconductor bonds, and surface Ga dangling bonds. The connection between the experimental observations and recent theoretical works is also discussed. © 1992.