Tuning the conductivity along atomic chains by selective chemisorption

F. Edler, I. Miccoli, J. P. Stöckmann, H. Pfnür, C. Braun, S. Neufeld, S. Sanna, W. G. Schmidt, and C. Tegenkamp
Phys. Rev. B 95, 125409 – Published 7 March 2017

Abstract

Adsorption of Au on vicinal Si(111) surfaces results in growth of long-range ordered metallic quantum wires. In this paper, we utilized site-specific and selective adsorption of oxygen to modify chemically the transport via different channels in the systems Si(553)-Au and Si(557)-Au. They were analyzed by electron diffraction and four-tip STM-based transport experiments. Modeling of the adsorption process by density functional theory shows that the adatoms and rest atoms on Si(557)-Au provide energetically favored adsorption sites, which predominantly alter the transport along the wire direction. Since this structural motif is missing on Si(553)-Au, the transport channels remain almost unaffected by oxidation.

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  • Received 5 December 2016
  • Revised 2 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.125409

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

F. Edler1, I. Miccoli1, J. P. Stöckmann1, H. Pfnür1,2, C. Braun3, S. Neufeld3, S. Sanna3, W. G. Schmidt3, and C. Tegenkamp1,2,*

  • 1Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
  • 2Laboratorium für Nano- und Quantenengineering (LNQE), Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
  • 3Lehrstuhl für Theoretische Materialphysik, Universität Paderborn, 33095 Paderborn, Germany

  • *tegenkamp@fkp.uni-hannover.de

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Vol. 95, Iss. 12 — 15 March 2017

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