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Condens. Matter 2017, 2(1), 7; doi:10.3390/condmat2010007

Effects of Domain Boundaries on the Diffraction Patterns of One-Dimensional Structures

1
Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49069 Osnabrück, Germany
2
Center of Physics and Chemistry of New Materials, Barbarastraße 7, 49069 Osnabrück, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Augusto Marcelli and Antonio Bianconi
Received: 10 November 2016 / Revised: 17 January 2017 / Accepted: 18 January 2017 / Published: 31 January 2017
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Abstract

Motivated by diffraction experiments on the (2√3 x √3) R30◦ reconstructed Si(111) surface due to deposition of rare earth elements (Dy, Tb) and silicide formation, we analyse the splitting and non-splitting of superstructure diffraction spots. For this purpose, we model diffraction patterns for one-dimensional structures generated by the binary surface technique and use supercell models to keep the analysis simple. Diffraction patterns are calculated in the framework of the kinematical diffraction theory, and they are analyzed as a function of the domains and domain boundaries. Basic properties of the diffraction pattern are analyzed for model systems of a two-fold and a three-fold periodicity. The rules derived from these calculations are applied to the “real-world” system of Si(111)-(2√3 × √3) R30◦-RESix (RE = Dy or Tb). Depending on the combination of domains and domain boundaries of different types, a plethora of different features are observed in the diffraction patterns. These are analyzed to determine the sizes of both domain boundaries and domains from experimentally observed splitting of specific superstructure spots. View Full-Text
Keywords: spot-profile analysis; one-dimensional physics; low energy electron diffraction; binary surface technique; supercell model; domain boundary spot-profile analysis; one-dimensional physics; low energy electron diffraction; binary surface technique; supercell model; domain boundary
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Timmer, F.; Wollschläger, J. Effects of Domain Boundaries on the Diffraction Patterns of One-Dimensional Structures. Condens. Matter 2017, 2, 7.

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