Restructuring of the Ge(100) surface by Na chains

W. Ernst, K.-L. Jonas, V. von Oeynhausen, C. Tegenkamp, and H. Pfnür
Phys. Rev. B 68, 205303 – Published 6 November 2003
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Abstract

The Na-induced surface structures on Ge(100) at concentrations below 0.1 monolayer (ML) have been investigated with low-energy electron diffraction and with scanning tunneling microscopy (STM). Annealing and partial desorption of higher coverages at temperatures between 650 and 680 K lead to the formation of characteristic chain structures, alternating between uncovered Ge dimer or double dimer rows and Na chains. The Na atoms have a preferential distance of three Ge lattice constants along the chains, but there is little correlation between different chains. Locally, only commensurate distances between Na chains of 4, 6 and 8 Ge lattice constants have been detected, with average distances being either commensurate or incommensurate, depending on the Na concentration. STM suggests complete removal of Ge-dimer rows below adsorbed Na chains. These alkali induced chainlike and well ordered self-organized modulations can be used as templates to impose these structures onto adsorbed ultra-thin insulating films.

  • Received 8 April 2003

DOI:https://doi.org/10.1103/PhysRevB.68.205303

©2003 American Physical Society

Authors & Affiliations

W. Ernst1, K.-L. Jonas2, V. von Oeynhausen2, C. Tegenkamp1, and H. Pfnür1,*

  • 1Institut für Festkörperphysik, Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany
  • 2Fachbereich Physik, Universität Rostock, Universitätsplatz 3, D-18055 Rostock, Germany

  • *Electronic address: pfnuer@fkp.uni-hannover.de

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Vol. 68, Iss. 20 — 15 November 2003

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