Identification of the Structure Model of the Si(111)(5×2)Au Surface

Tetsuroh Shirasawa, Wolfgang Voegeli, Takehiro Nojima, Yusaku Iwasawa, Yudai Yamaguchi, and Toshio Takahashi
Phys. Rev. Lett. 113, 165501 – Published 15 October 2014
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Abstract

The atomic structure of the Si(111)(5×2)Au surface, a periodic gold chain on the silicon surface, has been a long-debated issue in surface science. The recent three candidates, the so-called Erwin-Barke-Himpsel (EBH) model [S. C. Erwin, I. Barke, and F. J. Himpsel, Phys. Rev. B 80, 155409 (2009)], the Abukawa-Nishigaya (AN) model [T. Abukawa and Y. Nishigaya, Phys. Rev. Lett. 110, 036102 (2013)], and the Kwon-Kang (KK) model [S. G. Kwon and M. H. Kang, Phys. Rev. Lett. 113, 086101 (2014)] that has one additional Au atom than the EBH model are tested by surface x-ray diffraction data. A two-dimensional Patterson map constructed from the in-plane diffraction intensities rejects the AN model and prefers the KK model over the EBH model. On the basis of the arrangement of Au obtained from the Patterson map, all the reconstructed Si atoms, such as the so-called honeycomb chain structure, are directly imaged out by utilizing a holographic method. The KK model reproduces out-of-plane diffraction data as well.

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  • Received 13 June 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.165501

© 2014 American Physical Society

Authors & Affiliations

Tetsuroh Shirasawa1,2,*, Wolfgang Voegeli3, Takehiro Nojima1, Yusaku Iwasawa1, Yudai Yamaguchi1, and Toshio Takahashi1

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
  • 2JST, PRESTO, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
  • 3Department of Physics, Tokyo Gakugei University, 4-1-1 Nukuikitamachi, Koganei, Tokyo 184-0015, Japan

  • *sirasawa@issp.u-tokyo.ac.jp

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Issue

Vol. 113, Iss. 16 — 17 October 2014

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