Chen, Yequan, Chen, Zhendong, Sun, Wenxuan et al. (9 more authors) (2022) Observation of an anisotropic ultrafast spin relaxation process in large-area WTe2films. Journal of Applied Physics. 163903. ISSN 1089-7550
Abstract
Weyl semimetal Td-WTe2 hosts the natural broken inversion symmetry and strong spin-orbit coupling, which contains profound spin-related physics within a picosecond timescale. However, the comprehensive understanding of ultrafast spin behaviors in WTe2 is lacking due to its limited quality of large-scale films. Here, we report on an anisotropic ultrafast spin dynamics in highly oriented Td-WTe2 films using a femtosecond pump-probe technique at room temperature. A transient spin polarization-flip transition as fast as 0.8 ps is observed upon photoexcitation. The inversed spin is subsequently scattered by defects with a duration of about 5.9 ps. The whole relaxation process exhibits an intriguing dual anisotropy of sixfold and twofold symmetries, which stems from the energy band anisotropy of the WTe2 crystalline structure and the matrix element effect, respectively. Our work enriches the insights into the ultrafast opto-spintronics in topological Weyl semimetals.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Funding Information: We are grateful to F. Q. Song, C. F. Zhang, P. Wang, and B. Liu for fruitful discussions. This work was partially supported by the National Natural Science Foundation of China (NNSFC) (Grant Nos. 61822403, 11874203, and 11774160) and the National Key R&D Program of China (Grant Nos. 2017YFA0206304 and 2016YFA0300803). Publisher Copyright: © 2022 Author(s). Published under an exclusive license by AIP Publishing. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Sciences (York) > Electronic Engineering (York) |
Depositing User: | Pure (York) |
Date Deposited: | 07 Jun 2022 11:20 |
Last Modified: | 22 Mar 2025 00:10 |
Published Version: | https://doi.org/10.1063/5.0090935 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1063/5.0090935 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:187618 |