Valence band and core-level photoemission of Au/Ge(001): Band mapping and bonding sites

S. Meyer, L. Dudy, J. Schäfer, C. Blumenstein, P. Höpfner, T. E. Umbach, A. Dollinger, X. Y. Cui, L. Patthey, and R. Claessen
Phys. Rev. B 90, 125409 – Published 8 September 2014

Abstract

We have used photoemission spectroscopy in order to investigate the electronic states and chemical bonding related to Au induced atomic chains on the Ge(001) surface. Angle-resolved photoemission reveals two types of dispersions around the Fermi level whose intensities strongly depend on the incident photon energy. Around hν=100eV, the band structure is dominated by an electronlike band of mainly one-dimensional (1D) character, which shows Tomonaga-Luttinger-like power-law behavior in the k-integrated spectral function. In contrast, lower photon energies reveal a metallic holelike dispersion which resembles the Ge bulk structure with its heavy-hole, light-hole, and split-off branches. The Au 4f core-level spectra show two doublets indicating two different Au bonding sites, whereas the Ge 3d core-level shows two surface components and one bulk component.

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  • Received 15 November 2013
  • Revised 26 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.125409

©2014 American Physical Society

Authors & Affiliations

S. Meyer1, L. Dudy1, J. Schäfer1, C. Blumenstein1, P. Höpfner1, T. E. Umbach1, A. Dollinger1, X. Y. Cui2, L. Patthey2, and R. Claessen1

  • 1Physikalisches Institut und Röntgen Center for Complex Materials Systems, Universität Würzburg, D-97074 Würzburg, Germany
  • 2Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland

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Vol. 90, Iss. 12 — 15 September 2014

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