One-Dimensional Delocalized Adsorbate Bloch States on a Semiconductor Surface: C2H4/Si(001)(2×1)

W. Widdra, A. Fink, S. Gokhale, P. Trischberger, D. Menzel, U. Birkenheuer, U. Gutdeutsch, and N. Rösch
Phys. Rev. Lett. 80, 4269 – Published 11 May 1998
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Abstract

We report the observation of a 1D molecular adsorbate band structure caused by direct adsorbate-adsorbate interactions on a semiconductor. For ethylene chemisorbed on Si(001)(2×1) two adsorbate-derived electronic states, 1b3u and 1b2g, are found to delocalize along the Si-Si dimer rows. The corresponding bands can be followed in reciprocal space from the Γ¯ point into the third surface Brillouin zone. Density functional calculations for ethylene adsorbed on a silicon slab reproduce the experimental 1D band structure and allow us to identify the origin of the lateral interactions.

  • Received 15 December 1997

DOI:https://doi.org/10.1103/PhysRevLett.80.4269

©1998 American Physical Society

Authors & Affiliations

W. Widdra*, A. Fink, S. Gokhale, P. Trischberger, and D. Menzel

  • Physik-Department E20, Technische Universität München, D-85747 Garching, Germany

U. Birkenheuer, U. Gutdeutsch, and N. Rösch

  • Lehrstuhl für Theoretische Chemie, Technische Universität München, 85747 Garching, Germany

  • *Corresponding author. Electronic address: widdra@physik.tu-muenchen.de
  • Permanent address: Department of Instrumentation Science, University of Pune, Pune 411 007, India.

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Vol. 80, Iss. 19 — 11 May 1998

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