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

doi:10.1016/j.susc.2018.02.006

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

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

12 Citations (Scopus)

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) 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 language	English
Journal	Surface Science
Volume	678
Issue	12
Pages (from-to)	25 - 31
Number of pages	7
ISSN	0039-6028
DOIs	https://doi.org/10.1016/j.susc.2018.02.006
Publication status	Published - 1 Dec 2018

Keywords

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

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10.1016/j.susc.2018.02.006

https://arxiv.org/pdf/1802.06605.pdf

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@article{6156c2af314942c18e5edab2bbdfad62,

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) {\AA}-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.",

keywords = "Adsorption, Atom scattering, Atom-surface interaction, Bi2Te3, Bound states, Topological insulator",

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.}",

year = "2018",

month = dec,

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doi = "10.1016/j.susc.2018.02.006",

language = "English",

volume = "678",

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journal = "Surface Science",

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}

A Helium-Surface Interaction Potential of Bi₂Te₃(111) from Ultrahigh-Resolution Spin-Echo Measurements. / Tamtögl, Anton; Pusterhofer, Michael; Bremholm, Martin et al.
In: Surface Science, Vol. 678, No. 12, 01.12.2018, p. 25 - 31.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

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 - 2018/12/1

Y1 - 2018/12/1

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) 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.

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) 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.

KW - Adsorption

KW - Atom scattering

KW - Atom-surface interaction

KW - Bi2Te3

KW - Bound states

KW - Topological insulator

UR - http://www.scopus.com/inward/record.url?scp=85042177580&partnerID=8YFLogxK

U2 - 10.1016/j.susc.2018.02.006

DO - 10.1016/j.susc.2018.02.006

M3 - Journal article

AN - SCOPUS:85042177580

SN - 0039-6028

VL - 678

SP - 25

EP - 31

JO - Surface Science

JF - Surface Science

IS - 12

ER -

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

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