A Helium-Surface Interaction Potential of Bi2Te3(111) from Ultrahigh-Resolution Spin-Echo Measurements
We have determined an atom-surface interaction potential for the He–BiTe(111) system by analysing ultrahigh resolution measurements of selective adsorption resonances. The experimental measurements were obtained using He spin-echo spectrometry. Following an initial free-particle model analysis, we u...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/188675 |
| Acceso en línea: | http://hdl.handle.net/10261/188675 |
| Access Level: | acceso abierto |
| Palabra clave: | Adsorption Bound states Atom scattering Atom-surface interaction Bi2Te3 Topological insulators |
| Sumario: | We have determined an atom-surface interaction potential for the He–BiTe(111) system by analysing ultrahigh resolution measurements of selective adsorption resonances. The experimental measurements were obtained using He 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–BiTe(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. |
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