Observation of an anisotropic ultrafast spin relaxation process in large-area WTe2 films
Observation of an anisotropic ultrafast spin relaxation process in large-area WTe2 films
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大面积 WTe2 薄膜中各向异性超快自旋弛豫过程的观察
DOI:
10.1063/5.0090935
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发表时间:
2020-08
影响因子:
3.2
通讯作者:
Xuefeng Wang
中科院分区:
文献类型:
--
作者:
Yequan Chen;Zhendong Chen;Wenxuan Sun;Yongda Chen;Xianyang Lu;Xuezhong Ruan;Fengqiu Wang;Jing Wu;Liang He;Rong Zhang;Yongbing Xu;Xuefeng Wang
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.
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通讯作者:
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