A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements

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  • Anton Tamtögl, Cambridge University, Graz University of Technology
  • ,
  • Michael Pusterhofer, Graz University of Technology
  • ,
  • Martin Bremholm
  • Ellen M.J. Hedegaard
  • ,
  • Bo B. Iversen
  • Philip Hofmann
  • John Ellis, Cambridge University
  • ,
  • William Allison, Cambridge University
  • ,
  • S. Miret-Artés, CSIC - Instituto de Fisica Fundamental (IFF)
  • ,
  • Wolfgang E. Ernst, Graz University of Technology

We have determined an atom-surface interaction potential for the He-Bi2Te3(111) system by analysing ultrahigh resolution measurements of selective adsorption resonances. The experimental measurements were obtained using 3He spin-echo spectrometry. Following an initial free-particle model analysis, we use elastic close-coupling calculations to obtain a three-dimensional potential. The three-dimensional potential is then further refined based on the experimental data set, giving rise to an optimised potential which fully reproduces the experimental data. Based on this analysis, the He-Bi2Te3(111) interaction potential can be described by a corrugated Morse potential with a well depth D=(6.22±0.05)meV, a stiffness κ=(0.92±0.01) Å-1 and a surface electronic corrugation of (9.6 ± 0.2)% of the lattice constant. The improved uncertainties of the atom-surface interaction potential should also enable the use in inelastic close-coupled calculations in order to eventually study the temperature dependence and the line width of selective adsorption resonances.

Original languageEnglish
JournalSurface Science
Pages (from-to)25 - 31
Number of pages7
Publication statusPublished - 1 Dec 2018

    Research areas

  • Adsorption, Atom scattering, Atom-surface interaction, Bi2Te3, Bound states, Topological insulator

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