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Nonequilibrium topological spin textures in momentum space

Nonequilibrium quantum dynamics of many-body systems is the frontier of condensed matter physics; recent advances in various time-resolved spectroscopic techniques continue to reveal rich phenomena. Angle-resolved photoemission spectroscopy (ARPES) as one powerful technique can resolve electronic en...

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Detalles Bibliográficos
Autores principales: Zhang, Xiao-Xiao, Nagaosa, Naoto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944773/
https://www.ncbi.nlm.nih.gov/pubmed/35302888
http://dx.doi.org/10.1073/pnas.2116976119
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author Zhang, Xiao-Xiao
Nagaosa, Naoto
author_facet Zhang, Xiao-Xiao
Nagaosa, Naoto
author_sort Zhang, Xiao-Xiao
collection PubMed
description Nonequilibrium quantum dynamics of many-body systems is the frontier of condensed matter physics; recent advances in various time-resolved spectroscopic techniques continue to reveal rich phenomena. Angle-resolved photoemission spectroscopy (ARPES) as one powerful technique can resolve electronic energy, momentum, and spin along the time axis after excitation. However, dynamics of spin textures in momentum space remains mostly unexplored. Here, we demonstrate theoretically that the photoexcited surface state of genuine or magnetically doped topological insulators shows intriguing topological spin textures (i.e., tornado-like patterns) in the spin-resolved ARPES. We systematically reveal its origin as a unique nonequilibrium photoinduced topological winding phenomenon. As all intrinsic and extrinsic topological helicity factors of both material and light are embedded in a robust and delicate manner, the tornado patterns not only allow a remarkable tomography of such important system information, but also enable various unique dichroic topological switchings of the momentum-space spin texture. These results open a direction of nonequilibrium topological spin states in quantum materials.
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spelling pubmed-89447732022-03-25 Nonequilibrium topological spin textures in momentum space Zhang, Xiao-Xiao Nagaosa, Naoto Proc Natl Acad Sci U S A Physical Sciences Nonequilibrium quantum dynamics of many-body systems is the frontier of condensed matter physics; recent advances in various time-resolved spectroscopic techniques continue to reveal rich phenomena. Angle-resolved photoemission spectroscopy (ARPES) as one powerful technique can resolve electronic energy, momentum, and spin along the time axis after excitation. However, dynamics of spin textures in momentum space remains mostly unexplored. Here, we demonstrate theoretically that the photoexcited surface state of genuine or magnetically doped topological insulators shows intriguing topological spin textures (i.e., tornado-like patterns) in the spin-resolved ARPES. We systematically reveal its origin as a unique nonequilibrium photoinduced topological winding phenomenon. As all intrinsic and extrinsic topological helicity factors of both material and light are embedded in a robust and delicate manner, the tornado patterns not only allow a remarkable tomography of such important system information, but also enable various unique dichroic topological switchings of the momentum-space spin texture. These results open a direction of nonequilibrium topological spin states in quantum materials. National Academy of Sciences 2022-03-18 2022-03-22 /pmc/articles/PMC8944773/ /pubmed/35302888 http://dx.doi.org/10.1073/pnas.2116976119 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Physical Sciences
Zhang, Xiao-Xiao
Nagaosa, Naoto
Nonequilibrium topological spin textures in momentum space
title Nonequilibrium topological spin textures in momentum space
title_full Nonequilibrium topological spin textures in momentum space
title_fullStr Nonequilibrium topological spin textures in momentum space
title_full_unstemmed Nonequilibrium topological spin textures in momentum space
title_short Nonequilibrium topological spin textures in momentum space
title_sort nonequilibrium topological spin textures in momentum space
topic Physical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944773/
https://www.ncbi.nlm.nih.gov/pubmed/35302888
http://dx.doi.org/10.1073/pnas.2116976119
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