Electron-phonon coupling in topological surface states: The role of polar optical modes

Abstract The use of topological edge states for spintronic applications could be severely hampered by limited lifetimes due to intrinsic many-body interactions, in particular electron-phonon coupling. Previous works to determine the intrinsic coupling strength did not provide a coherent answer. Here...

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Autores principales:	Rolf Heid, Irina Yu. Sklyadneva, Evgueni V. Chulkov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8b0dcf72b79e468da247194c813dfe09
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spelling	oai:doaj.org-article:8b0dcf72b79e468da247194c813dfe092021-12-02T12:32:14ZElectron-phonon coupling in topological surface states: The role of polar optical modes10.1038/s41598-017-01128-12045-2322https://doaj.org/article/8b0dcf72b79e468da247194c813dfe092017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01128-1https://doaj.org/toc/2045-2322Abstract The use of topological edge states for spintronic applications could be severely hampered by limited lifetimes due to intrinsic many-body interactions, in particular electron-phonon coupling. Previous works to determine the intrinsic coupling strength did not provide a coherent answer. Here, the electron-phonon interaction in the metallic surface state of 3D topological insulators is revised within a first principles framework. For the archetypical cases of Bi2Se3 and Bi2Te3, we find an overall weak coupling constant of less than 0.15, but with a characteristic energy dependence. Derived electronic self-energies compare favorably with previous angle-resolved photoemission spectroscopy results. The prevailing coupling is carried by optical modes of polar character, which is weakly screened by the metallic surface state and can be reduced by doping into bulk bands. We do not find any indication of a strong coupling to the A1g mode or the presence of a Kohn anomaly in the surface phonon spectrum. The weak intrinsic electron-phonon coupling guarantees long-lived quasiparticles at elevated temperatures.Rolf HeidIrina Yu. SklyadnevaEvgueni V. ChulkovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rolf Heid Irina Yu. Sklyadneva Evgueni V. Chulkov Electron-phonon coupling in topological surface states: The role of polar optical modes
description	Abstract The use of topological edge states for spintronic applications could be severely hampered by limited lifetimes due to intrinsic many-body interactions, in particular electron-phonon coupling. Previous works to determine the intrinsic coupling strength did not provide a coherent answer. Here, the electron-phonon interaction in the metallic surface state of 3D topological insulators is revised within a first principles framework. For the archetypical cases of Bi2Se3 and Bi2Te3, we find an overall weak coupling constant of less than 0.15, but with a characteristic energy dependence. Derived electronic self-energies compare favorably with previous angle-resolved photoemission spectroscopy results. The prevailing coupling is carried by optical modes of polar character, which is weakly screened by the metallic surface state and can be reduced by doping into bulk bands. We do not find any indication of a strong coupling to the A1g mode or the presence of a Kohn anomaly in the surface phonon spectrum. The weak intrinsic electron-phonon coupling guarantees long-lived quasiparticles at elevated temperatures.
format	article
author	Rolf Heid Irina Yu. Sklyadneva Evgueni V. Chulkov
author_facet	Rolf Heid Irina Yu. Sklyadneva Evgueni V. Chulkov
author_sort	Rolf Heid
title	Electron-phonon coupling in topological surface states: The role of polar optical modes
title_short	Electron-phonon coupling in topological surface states: The role of polar optical modes
title_full	Electron-phonon coupling in topological surface states: The role of polar optical modes
title_fullStr	Electron-phonon coupling in topological surface states: The role of polar optical modes
title_full_unstemmed	Electron-phonon coupling in topological surface states: The role of polar optical modes
title_sort	electron-phonon coupling in topological surface states: the role of polar optical modes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/8b0dcf72b79e468da247194c813dfe09
work_keys_str_mv	AT rolfheid electronphononcouplingintopologicalsurfacestatestheroleofpolaropticalmodes AT irinayusklyadneva electronphononcouplingintopologicalsurfacestatestheroleofpolaropticalmodes AT evguenivchulkov electronphononcouplingintopologicalsurfacestatestheroleofpolaropticalmodes
_version_	1718394169874972672

Electron-phonon coupling in topological surface states: The role of polar optical modes

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