Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing

We present an experimental study of inelastic scattering processes on the (111) surface of the topological insulator Sb2Te3 using helium atom scattering. In contrast to other binary topological insulators such as Bi2Se3 and Bi2Te3, Sb2Te3 is much less studied and the as-grown Sb2Te3 sample turns out...

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Autores: Ruckhofer, Adrian, Halbritter, Simon, Lund, Henriette E., Holt, Ann Julie U., Bianchi, Marco, Bremholm, Martin, Benedek, Giorgio, Hofmann, Philip, Ernst, Wolfgang E., Tamtoegl, Anton
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/51774
Acceso en línea:http://hdl.handle.net/10810/51774
Access Level:acceso abierto
Palabra clave:topological insulators
surface-states
dynamics
spectroscopy
transport
Bi2Te3
Bi2Se3
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spelling Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and SurfingRuckhofer, AdrianHalbritter, SimonLund, Henriette E.Holt, Ann Julie U.Bianchi, MarcoBremholm, MartinBenedek, GiorgioHofmann, PhilipErnst, Wolfgang E.Tamtoegl, Antontopological insulatorssurface-statesdynamicsspectroscopytransportBi2Te3Bi2Se3We present an experimental study of inelastic scattering processes on the (111) surface of the topological insulator Sb2Te3 using helium atom scattering. In contrast to other binary topological insulators such as Bi2Se3 and Bi2Te3, Sb2Te3 is much less studied and the as-grown Sb2Te3 sample turns out to be p-doped, with the Fermi-level located below the Dirac-point as confirmed by angle-resolved photoemission spectroscopy. We report the surface phonon dispersion along both high symmetry directions in the energy region below 11 meV, where the Rayleigh mode exhibits the strongest intensity. The experimental data is compared with a study based on density functional perturbation theory calculations, providing good agreement except for a set of additional peculiar inelastic events below the Rayleigh mode. In addition, an analysis of angular scans with respect to a number of additional inelastic events is presented, including resonance enhancement, kinematical focusing, focused inelastic resonance and surfing. In the latter case, phonon-assisted adsorption of the incident helium atom gives rise to a bound state where the helium atom rides the created Rayleigh wave.The authors are grateful for financial support by the FWF (Austrian Science Fund) within the project P29641-N36, as well as by NAWI Graz. We would like to thank the Aarhus University Research Foundation, VILLUM FOUNDATION via the Centre of Excellence for Dirac Materials (Grant No. 11744) and the SPP1666 of the DFG (Grant No. HO 5150/1-2) for financial support. M. Bremholm acknowledges financial support from the Center of Materials Crystallography (CMC) and the Danish National Research Foundation (DNRF93).Royal Society Of Chemistry202120212021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/51774reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://pubs.rsc.org/en/content/articlelanding/2021/CP/D0CP04738D#!divAbstractinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/3.0/es/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY-NC 3.0)Atribución-NoComercial 3.0 Españaoai:addi.ehu.eus:10810/517742026-06-18T09:23:17Z
dc.title.none.fl_str_mv Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
title Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
spellingShingle Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
Ruckhofer, Adrian
topological insulators
surface-states
dynamics
spectroscopy
transport
Bi2Te3
Bi2Se3
title_short Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
title_full Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
title_fullStr Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
title_full_unstemmed Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
title_sort Inelastic Helium Atom Scattering from Sb2Te3(111): Phonon Dispersion, Focusing Effects and Surfing
dc.creator.none.fl_str_mv Ruckhofer, Adrian
Halbritter, Simon
Lund, Henriette E.
Holt, Ann Julie U.
Bianchi, Marco
Bremholm, Martin
Benedek, Giorgio
Hofmann, Philip
Ernst, Wolfgang E.
Tamtoegl, Anton
author Ruckhofer, Adrian
author_facet Ruckhofer, Adrian
Halbritter, Simon
Lund, Henriette E.
Holt, Ann Julie U.
Bianchi, Marco
Bremholm, Martin
Benedek, Giorgio
Hofmann, Philip
Ernst, Wolfgang E.
Tamtoegl, Anton
author_role author
author2 Halbritter, Simon
Lund, Henriette E.
Holt, Ann Julie U.
Bianchi, Marco
Bremholm, Martin
Benedek, Giorgio
Hofmann, Philip
Ernst, Wolfgang E.
Tamtoegl, Anton
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv topological insulators
surface-states
dynamics
spectroscopy
transport
Bi2Te3
Bi2Se3
topic topological insulators
surface-states
dynamics
spectroscopy
transport
Bi2Te3
Bi2Se3
description We present an experimental study of inelastic scattering processes on the (111) surface of the topological insulator Sb2Te3 using helium atom scattering. In contrast to other binary topological insulators such as Bi2Se3 and Bi2Te3, Sb2Te3 is much less studied and the as-grown Sb2Te3 sample turns out to be p-doped, with the Fermi-level located below the Dirac-point as confirmed by angle-resolved photoemission spectroscopy. We report the surface phonon dispersion along both high symmetry directions in the energy region below 11 meV, where the Rayleigh mode exhibits the strongest intensity. The experimental data is compared with a study based on density functional perturbation theory calculations, providing good agreement except for a set of additional peculiar inelastic events below the Rayleigh mode. In addition, an analysis of angular scans with respect to a number of additional inelastic events is presented, including resonance enhancement, kinematical focusing, focused inelastic resonance and surfing. In the latter case, phonon-assisted adsorption of the incident helium atom gives rise to a bound state where the helium atom rides the created Rayleigh wave.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/51774
url http://hdl.handle.net/10810/51774
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://pubs.rsc.org/en/content/articlelanding/2021/CP/D0CP04738D#!divAbstract
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc/3.0/es/
Atribución-NoComercial 3.0 España
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc/3.0/es/
Atribución-NoComercial 3.0 España
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Royal Society Of Chemistry
publisher.none.fl_str_mv Royal Society Of Chemistry
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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