Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators

Topologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we investigate these dynamics in topological insulators (TIs) of the bismuth and antimony cha...

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Autores: Kovalev, Sergey|||0000-0002-2290-1016, Tielrooij, Klaas-Jan|||0000-0002-0055-6231, Deinert, Jan-Christoph|||0000-0001-6211-0158, Ilyakov, Igor|||0000-0002-5928-7996, Awari, Nilesh, Chen, Min|||0000-0001-5230-360X, Ponomaryov, Alexey N., Bawatna, Mohammed|||0000-0002-2382-3363, de Oliveira, T.V.A.G., Eng, Lukas, Kuznetsov, Kirill|||0000-0001-6075-7628, Safronenkov, D.A., Kitaeva, Galiya|||0000-0002-4860-9937, Kuznetsov, P.I., Hafez, Hassan A., Turchinovich, Dmitry|||0000-0003-0054-7092, Gensch, Michael
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:268445
Acceso en línea:https://ddd.uab.cat/record/268445
https://dx.doi.org/urn:doi:10.1038/s41535-021-00384-9
Access Level:acceso abierto
Palabra clave:Topological insulators
Ultrafast photonics
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spelling Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulatorsKovalev, Sergey|||0000-0002-2290-1016Tielrooij, Klaas-Jan|||0000-0002-0055-6231Deinert, Jan-Christoph|||0000-0001-6211-0158Ilyakov, Igor|||0000-0002-5928-7996Awari, NileshChen, Min|||0000-0001-5230-360XPonomaryov, Alexey N.Bawatna, Mohammed|||0000-0002-2382-3363de Oliveira, T.V.A.G.Eng, LukasKuznetsov, Kirill|||0000-0001-6075-7628Safronenkov, D.A.Kitaeva, Galiya|||0000-0002-4860-9937Kuznetsov, P.I.Hafez, Hassan A.Turchinovich, Dmitry|||0000-0003-0054-7092Gensch, MichaelTopological insulatorsUltrafast photonicsTopologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we investigate these dynamics in topological insulators (TIs) of the bismuth and antimony chalcogenide family, where we isolate the response of Dirac fermions at the surface from the response of bulk carriers by combining photoexcitation with below-bandgap terahertz (THz) photons and TI samples with varying Fermi level, including one sample with the Fermi level located within the bandgap. We identify distinctly faster relaxation of charge carriers in the topologically protected Dirac surface states (few hundred femtoseconds), compared to bulk carriers (few picoseconds). In agreement with such fast cooling dynamics, we observe THz harmonic generation without any saturation effects for increasing incident fields, unlike graphene which exhibits strong saturation. This opens up promising avenues for increased THz nonlinear conversion efficiencies, and high-bandwidth optoelectronic and spintronic information and communication applications. 22021-01-0120212021-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/268445https://dx.doi.org/urn:doi:10.1038/s41535-021-00384-9reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 804349European Commission https://doi.org/10.13039/501100000780 737038Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2684452026-06-06T12:50:31Z
dc.title.none.fl_str_mv Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
title Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
spellingShingle Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
Kovalev, Sergey|||0000-0002-2290-1016
Topological insulators
Ultrafast photonics
title_short Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
title_full Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
title_fullStr Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
title_full_unstemmed Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
title_sort Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
dc.creator.none.fl_str_mv Kovalev, Sergey|||0000-0002-2290-1016
Tielrooij, Klaas-Jan|||0000-0002-0055-6231
Deinert, Jan-Christoph|||0000-0001-6211-0158
Ilyakov, Igor|||0000-0002-5928-7996
Awari, Nilesh
Chen, Min|||0000-0001-5230-360X
Ponomaryov, Alexey N.
Bawatna, Mohammed|||0000-0002-2382-3363
de Oliveira, T.V.A.G.
Eng, Lukas
Kuznetsov, Kirill|||0000-0001-6075-7628
Safronenkov, D.A.
Kitaeva, Galiya|||0000-0002-4860-9937
Kuznetsov, P.I.
Hafez, Hassan A.
Turchinovich, Dmitry|||0000-0003-0054-7092
Gensch, Michael
author Kovalev, Sergey|||0000-0002-2290-1016
author_facet Kovalev, Sergey|||0000-0002-2290-1016
Tielrooij, Klaas-Jan|||0000-0002-0055-6231
Deinert, Jan-Christoph|||0000-0001-6211-0158
Ilyakov, Igor|||0000-0002-5928-7996
Awari, Nilesh
Chen, Min|||0000-0001-5230-360X
Ponomaryov, Alexey N.
Bawatna, Mohammed|||0000-0002-2382-3363
de Oliveira, T.V.A.G.
Eng, Lukas
Kuznetsov, Kirill|||0000-0001-6075-7628
Safronenkov, D.A.
Kitaeva, Galiya|||0000-0002-4860-9937
Kuznetsov, P.I.
Hafez, Hassan A.
Turchinovich, Dmitry|||0000-0003-0054-7092
Gensch, Michael
author_role author
author2 Tielrooij, Klaas-Jan|||0000-0002-0055-6231
Deinert, Jan-Christoph|||0000-0001-6211-0158
Ilyakov, Igor|||0000-0002-5928-7996
Awari, Nilesh
Chen, Min|||0000-0001-5230-360X
Ponomaryov, Alexey N.
Bawatna, Mohammed|||0000-0002-2382-3363
de Oliveira, T.V.A.G.
Eng, Lukas
Kuznetsov, Kirill|||0000-0001-6075-7628
Safronenkov, D.A.
Kitaeva, Galiya|||0000-0002-4860-9937
Kuznetsov, P.I.
Hafez, Hassan A.
Turchinovich, Dmitry|||0000-0003-0054-7092
Gensch, Michael
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Topological insulators
Ultrafast photonics
topic Topological insulators
Ultrafast photonics
description Topologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we investigate these dynamics in topological insulators (TIs) of the bismuth and antimony chalcogenide family, where we isolate the response of Dirac fermions at the surface from the response of bulk carriers by combining photoexcitation with below-bandgap terahertz (THz) photons and TI samples with varying Fermi level, including one sample with the Fermi level located within the bandgap. We identify distinctly faster relaxation of charge carriers in the topologically protected Dirac surface states (few hundred femtoseconds), compared to bulk carriers (few picoseconds). In agreement with such fast cooling dynamics, we observe THz harmonic generation without any saturation effects for increasing incident fields, unlike graphene which exhibits strong saturation. This opens up promising avenues for increased THz nonlinear conversion efficiencies, and high-bandwidth optoelectronic and spintronic information and communication applications.
publishDate 2021
dc.date.none.fl_str_mv 2
2021-01-01
2021
2021-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/268445
https://dx.doi.org/urn:doi:10.1038/s41535-021-00384-9
url https://ddd.uab.cat/record/268445
https://dx.doi.org/urn:doi:10.1038/s41535-021-00384-9
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 804349
European Commission https://doi.org/10.13039/501100000780 737038
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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