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Coherent ultrafast spin-dynamics probed in three dimensional topological insulators

Topological insulators are candidates to open up a novel route in spin based electronics. Different to traditional ferromagnetic materials, where the carrier spin-polarization and magnetization are based on the exchange interaction, the spin properties in topological insulators are based on the coup...

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Autores principales: Boschini, F., Mansurova, M., Mussler, G., Kampmeier, J., Grützmacher, D., Braun, L., Katmis, F., Moodera, J. S., Dallera, C., Carpene, E., Franz, C., Czerner, M., Heiliger, C., Kampfrath, T., Münzenberg, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4625143/
https://www.ncbi.nlm.nih.gov/pubmed/26510509
http://dx.doi.org/10.1038/srep15304
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author Boschini, F.
Mansurova, M.
Mussler, G.
Kampmeier, J.
Grützmacher, D.
Braun, L.
Katmis, F.
Moodera, J. S.
Dallera, C.
Carpene, E.
Franz, C.
Czerner, M.
Heiliger, C.
Kampfrath, T.
Münzenberg, M.
author_facet Boschini, F.
Mansurova, M.
Mussler, G.
Kampmeier, J.
Grützmacher, D.
Braun, L.
Katmis, F.
Moodera, J. S.
Dallera, C.
Carpene, E.
Franz, C.
Czerner, M.
Heiliger, C.
Kampfrath, T.
Münzenberg, M.
author_sort Boschini, F.
collection PubMed
description Topological insulators are candidates to open up a novel route in spin based electronics. Different to traditional ferromagnetic materials, where the carrier spin-polarization and magnetization are based on the exchange interaction, the spin properties in topological insulators are based on the coupling of spin- and orbit interaction connected to its momentum. Specific ways to control the spin-polarization with light have been demonstrated: the energy momentum landscape of the Dirac cone provides spin-momentum locking of the charge current and its spin. We investigate a spin-related signal present only during the laser excitation studying real and imaginary part of the complex Kerr angle by disentangling spin and lattice contributions. This coherent signal is only present at the time of the pump-pulses’ light field and can be described in terms of a Raman coherence time. The Raman transition involves states at the bottom edge of the conduction band. We demonstrate a coherent femtosecond control of spin-polarization for electronic states at around the Dirac cone.
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spelling pubmed-46251432015-11-03 Coherent ultrafast spin-dynamics probed in three dimensional topological insulators Boschini, F. Mansurova, M. Mussler, G. Kampmeier, J. Grützmacher, D. Braun, L. Katmis, F. Moodera, J. S. Dallera, C. Carpene, E. Franz, C. Czerner, M. Heiliger, C. Kampfrath, T. Münzenberg, M. Sci Rep Article Topological insulators are candidates to open up a novel route in spin based electronics. Different to traditional ferromagnetic materials, where the carrier spin-polarization and magnetization are based on the exchange interaction, the spin properties in topological insulators are based on the coupling of spin- and orbit interaction connected to its momentum. Specific ways to control the spin-polarization with light have been demonstrated: the energy momentum landscape of the Dirac cone provides spin-momentum locking of the charge current and its spin. We investigate a spin-related signal present only during the laser excitation studying real and imaginary part of the complex Kerr angle by disentangling spin and lattice contributions. This coherent signal is only present at the time of the pump-pulses’ light field and can be described in terms of a Raman coherence time. The Raman transition involves states at the bottom edge of the conduction band. We demonstrate a coherent femtosecond control of spin-polarization for electronic states at around the Dirac cone. Nature Publishing Group 2015-10-29 /pmc/articles/PMC4625143/ /pubmed/26510509 http://dx.doi.org/10.1038/srep15304 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Boschini, F.
Mansurova, M.
Mussler, G.
Kampmeier, J.
Grützmacher, D.
Braun, L.
Katmis, F.
Moodera, J. S.
Dallera, C.
Carpene, E.
Franz, C.
Czerner, M.
Heiliger, C.
Kampfrath, T.
Münzenberg, M.
Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title_full Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title_fullStr Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title_full_unstemmed Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title_short Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
title_sort coherent ultrafast spin-dynamics probed in three dimensional topological insulators
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4625143/
https://www.ncbi.nlm.nih.gov/pubmed/26510509
http://dx.doi.org/10.1038/srep15304
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