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

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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.
Originalspracheenglisch
FachzeitschriftSurface science
DOIs
PublikationsstatusVeröffentlicht - 13 Feb 2018

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

Schlagwörter

    Fields of Expertise

    • Advanced Materials Science

    Dies zitieren

    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.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    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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    title = "A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements",
    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.",
    keywords = "Bi2Te3, Topological insulator, Adsorption, Bound states, Atom scattering, Atom-surface interaction",
    author = "Anton Tamt{\"o}gl and Michael Pusterhofer and Martin Bremholm and Hedegaard, {Ellen M.J.} and Iversen, {Bo B.} and Philip Hofmann and John Ellis and William Allison and S. Miret-Art{\'e}s and Ernst, {Wolfgang E.}",
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    T1 - A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements

    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.

    PY - 2018/2/13

    Y1 - 2018/2/13

    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.

    KW - Bi2Te3

    KW - Topological insulator

    KW - Adsorption

    KW - Bound states

    KW - Atom scattering

    KW - Atom-surface interaction

    U2 - 10.1016/j.susc.2018.02.006

    DO - 10.1016/j.susc.2018.02.006

    M3 - Article

    JO - Surface science

    JF - Surface science

    SN - 0039-6028

    ER -