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

Anton Tamtögl, Michael Pusterhofer, Martin Bremholm, Ellen M.J. Hedegaard, Bo B. Iversen, Philip Hofmann, John Ellis, William Allison, S. Miret-Artés, Wolfgang E. Ernst

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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) 1/Å 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
DOIs
Publication statusPublished - 13 Feb 2018

Fingerprint

Helium
surface reactions
echoes
helium
Morse potential
Adsorption
Atoms
Linewidth
Spectrometry
Lattice constants
Stiffness
adsorption
atoms
stiffness
Temperature
temperature dependence
electronics
spectroscopy

Keywords

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

Fields of Expertise

  • Advanced Materials Science

Cite this

A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements. / Tamtögl, Anton; Pusterhofer, Michael; Bremholm, Martin; Hedegaard, Ellen M.J.; Iversen, Bo B.; Hofmann, Philip; Ellis, John; Allison, William; Miret-Artés, S.; Ernst, Wolfgang E.

In: Surface science, 13.02.2018.

Research output: Contribution to journalArticleResearchpeer-review

Tamtögl, Anton ; Pusterhofer, Michael ; Bremholm, Martin ; Hedegaard, Ellen M.J. ; Iversen, Bo B. ; Hofmann, Philip ; Ellis, John ; Allison, William ; Miret-Artés, S. ; Ernst, Wolfgang E. / A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements. In: Surface science. 2018.
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abstract = "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) 1/{\AA} 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.",
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AU - Tamtögl, Anton

AU - Pusterhofer, Michael

AU - Bremholm, Martin

AU - Hedegaard, Ellen M.J.

AU - Iversen, Bo B.

AU - Hofmann, Philip

AU - Ellis, John

AU - Allison, William

AU - Miret-Artés, S.

AU - Ernst, Wolfgang E.

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N2 - 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) 1/Å 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.

AB - 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) 1/Å 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.

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KW - Atom-surface interaction

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