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

Kovalev, Sergey and Tielrooij, Klaas-Jan and Deinert, Jan-Christoph and Ilyakov, Igor and Awari, Nilesh and Chen, Min and Ponimarov, Alexander and Bawatna, Mohammad and de Oliveira, Thales and Eng, Lukas and Kutznetsov, KA and Safronenkov, DA and Kitaeva, GH and Kutznetsov, PI and Hafez, Hassan A. and Turchinovich, Dmitry and Gensch, Michael (2021) Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators. npj Quantum Materials, 6, pp. 1-6. Springer Nature. doi: 10.1038/s41535-021-00384-9. ISSN 2397-4648.

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Official URL: https://www.nature.com/articles/s41535-021-00384-9

Abstract

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).

Item URL in elib:https://elib.dlr.de/148017/
Document Type:Article
Title:Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kovalev, SergeyHelmholtz‐Zentrum Dresden‐RossendorfUNSPECIFIEDUNSPECIFIED
Tielrooij, Klaas-JanCatalan Institute of Nanoscience and Nanotechnology, Barcelona, SpainUNSPECIFIEDUNSPECIFIED
Deinert, Jan-ChristophHelmholtz-Zentrum Dresden-RossendorfUNSPECIFIEDUNSPECIFIED
Ilyakov, IgorHelmholtz-Zentrum Dresden-RossendorfUNSPECIFIEDUNSPECIFIED
Awari, NileshHelmholtz-Zentrum Dresden-RossendorfUNSPECIFIEDUNSPECIFIED
Chen, MinHelmholtz-Zentrum Dresden-Rossendorf / Technische Universität BerlinUNSPECIFIEDUNSPECIFIED
Ponimarov, AlexanderHelmholtz-Zentrum Dresden-RossendorfUNSPECIFIEDUNSPECIFIED
Bawatna, MohammadHelmholtz-Zentrum Dresden-RossendorfUNSPECIFIEDUNSPECIFIED
de Oliveira, ThalesTU DresdenUNSPECIFIEDUNSPECIFIED
Eng, LukasTU DresdenUNSPECIFIEDUNSPECIFIED
Kutznetsov, KALomonosov Moscow State UniversityUNSPECIFIEDUNSPECIFIED
Safronenkov, DALomonosov Moscow State UniversityUNSPECIFIEDUNSPECIFIED
Kitaeva, GHLomonosov Moscow State UniversityUNSPECIFIEDUNSPECIFIED
Kutznetsov, PIKotelnikov IRE RASUNSPECIFIEDUNSPECIFIED
Hafez, Hassan A.Universität BielefeldUNSPECIFIEDUNSPECIFIED
Turchinovich, DmitryUniversität BielefeldUNSPECIFIEDUNSPECIFIED
Gensch, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7755-1618UNSPECIFIED
Date:1 October 2021
Journal or Publication Title:npj Quantum Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
DOI:10.1038/s41535-021-00384-9
Page Range:pp. 1-6
Publisher:Springer Nature
ISSN:2397-4648
Status:Published
Keywords:Quantenmaterialien, Quantentechnologie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Robotics
DLR - Research area:Raumfahrt
DLR - Program:R RO - Robotics
DLR - Research theme (Project):R - OptoRob [RO]
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Gensch, Michael
Deposited On:10 Jan 2022 07:17
Last Modified:05 Dec 2023 07:44

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