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dc.contributor.authorZhuo, Xiaoen_US
dc.contributor.authorLai, Jiaweien_US
dc.contributor.authorYu, Pengen_US
dc.contributor.authorYu, Zeen_US
dc.contributor.authorMa, Junchaoen_US
dc.contributor.authorLu, Weien_US
dc.contributor.authorLiu, Miaoen_US
dc.contributor.authorLiu, Zhengen_US
dc.contributor.authorSun, Dongen_US
dc.identifier.citationZhuo, X., Lai, J., Yu, P., Yu, Z., Ma, J., Lu, W., Liu, M., Liu, Z. & Sun, D. (2021). Dynamical evolution of anisotropic response of type-II Weyl semimetal TaIrTe₄ under ultrafast photoexcitation. Light: Science & Applications, 10(1), 101-.
dc.description.abstractLayered type-II Weyl semimetals, such as WTe₂, MoTe₂, and TaIrTe₄ have been demonstrated as a supreme photodetection material with topologically enhanced responsivity and specific sensitivity to the orbital angular momentum of light. Toward future device applications with high performance and ultrafast response, it is necessary to understand the dynamical processes of hot carriers and transient electronic properties of these materials under photoexcitation. In this work, mid-infrared ultrafast spectroscopy is performed to study the dynamical evolution of the anisotropic response of TaIrTe₄. The dynamical relaxation of photoexcited carriers exhibits three exponential decay components relating to optical/acoustic phonon cooling and subsequent heat transfer to the substrate. The ultrafast transient dynamics imply that TaIrTe₄ is an ideal material candidate for ultrafast optoelectronic applications, especially in the long-wavelength region. The angle-resolved measurement of transient reflection reveals that the reflectivity becomes less anisotropic in the quasi-equilibrium state, indicating a reduction in the anisotropy of dynamical conductivity in presence of photoexcited hot carriers. The results are indispensable in material engineering for polarization-sensitive optoelectronics and high field electronics.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofLight: Science & Applicationsen_US
dc.rights© 2021 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
dc.titleDynamical evolution of anisotropic response of type-II Weyl semimetal TaIrTe₄ under ultrafast photoexcitationen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.researchCentre for Programmable Materialsen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsInfrared Spectroscopyen_US
dc.subject.keywordsOptical Physicsen_US
dc.description.acknowledgementThis project has been supported by the National Key Research and Development Program of China (2020YFA0308800), the National Natural Science Foundation of China (NSFC Grants Nos. 12034001, 11674013, 91750109), Beijing Nature Science Foundation (JQ19001). J. L. is also supported by China National Postdoctoral for Innovative Talent (BX20200015). Z.L. and P.Y. acknowledge support from the Singapore National Research Foundation under NRF award number NRF-RF2013-08, MOE Tier 2 MOE2016-T2-2-153, and MOE2017-T2-2-136. P.Y. is also supported by 100 Top Talents Program (No. 29000-18841216) of Sun Yat-sen University.en_US
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