Structure and electronic spectroscopy of steps on GaAs(110) surfaces

Steps on GaAs(110) surfaces, with step-normal vectors parallel to [001], are studied by scanning tunneling microscopy and spectroscopy. Two possible orientations of the steps occur, with outward normal vectors of [001] or [ 00 - 1 ], which in simple bulk-terminated form have Ga (cations) or As (anio...

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Veröffentlicht in:	Surface science 2012, Vol.606 (1), p.28-33
Hauptverfasser:	Gaan, S., Feenstra, R.M., Ebert, Ph, Dunin-Borkowski, R.E., Walker, J., Towe, E.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Electronics Exact sciences and technology Gallium gallium arsenide Mathematical analysis Orientation Physics Scanning tunneling microscopy Scanning tunneling spectroscopy Spectroscopy Stopping Surface steps Vectors (mathematics)
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container_title	Surface science
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creator	Gaan, S. Feenstra, R.M. Ebert, Ph Dunin-Borkowski, R.E. Walker, J. Towe, E.
description	Steps on GaAs(110) surfaces, with step-normal vectors parallel to [001], are studied by scanning tunneling microscopy and spectroscopy. Two possible orientations of the steps occur, with outward normal vectors of [001] or [ 00 - 1 ], which in simple bulk-terminated form have Ga (cations) or As (anions) on their edges, respectively. The latter type of step in n-type or undoped material is found to retain its bulk-terminated form. A band of states is observed extending out from the valence band, associated with the dangling bonds of the terminating As atoms. It is argued that compensation of the dangling bonds on the step edges is the driving force for the step structure, producing reconstruction of the step edges in certain cases. ► Used scanning tunneling microscopy to study steps on GaAs(110) surface. ► Determined structure of As-edge steps on GaAs(110) surface. ► Determined spectrum of electronic states of As-edge steps on GaAs(110) surface. ► Found states of As-edge steps that extend into the GaAs band gap. ► Observed compensating defects (that minimize charge) at As-edge steps.
doi_str_mv	10.1016/j.susc.2011.08.017
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subjects	Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Electronics Exact sciences and technology Gallium gallium arsenide Mathematical analysis Orientation Physics Scanning tunneling microscopy Scanning tunneling spectroscopy Spectroscopy Stopping Surface steps Vectors (mathematics)
title	Structure and electronic spectroscopy of steps on GaAs(110) surfaces
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