Spin Hall effect in a spin-1 chiral semimetal
The spin-1 chiral semimetal is a state of quantum matter hosting unconventional chiral fermions that extend beyond the common Dirac and Weyl fermions. B20-type CoSi is a prototypal material that accommodates such an exotic quasiparticle. To date, the spin-transport properties in the spin-1 chiral se...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.033101 |
| _version_ | 1797211030297772032 |
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| author | Ke Tang Yong-Chang Lau Kenji Nawa Zhenchao Wen Qingyi Xiang Hiroaki Sukegawa Takeshi Seki Yoshio Miura Koki Takanashi Seiji Mitani |
| author_facet | Ke Tang Yong-Chang Lau Kenji Nawa Zhenchao Wen Qingyi Xiang Hiroaki Sukegawa Takeshi Seki Yoshio Miura Koki Takanashi Seiji Mitani |
| author_sort | Ke Tang |
| collection | DOAJ |
| description | The spin-1 chiral semimetal is a state of quantum matter hosting unconventional chiral fermions that extend beyond the common Dirac and Weyl fermions. B20-type CoSi is a prototypal material that accommodates such an exotic quasiparticle. To date, the spin-transport properties in the spin-1 chiral semimetals have not been thoroughly explored. In this work, we fabricated B20-CoSi thin films on sapphire c-plane substrates by magnetron sputtering and studied the spin Hall effect (SHE) by combining experiments and first-principles calculations. The SHE of CoSi was investigated using CoSi/CoFeB/MgO heterostructures via spin Hall magnetoresistance and harmonic Hall measurements. First-principles calculations yield an intrinsic spin Hall conductivity (SHC) at the Fermi level that is consistent with the experiments and reveal its unique Fermi-energy dependence. Unlike the Dirac and Weyl fermion-mediated Hall conductivities that exhibit a peaklike structure centering around the topological node, SHC of B20-CoSi is odd and crosses zero at the node with two antisymmetric local extrema of opposite sign situated below and above in energy. Hybridization between Co d-Si p orbitals and spin-orbit coupling are essential for the SHC, despite the small (∼1%) weight of the Si p orbital near the Fermi level. This work expands the horizon of topological spintronics and highlights the importance of Fermi-level tuning in order to fully exploit the topology of spin-1 chiral fermions for spin-current generation. |
| first_indexed | 2024-04-24T10:20:00Z |
| format | Article |
| id | doaj.art-f6aa1b4fa6b74770990632172fa7632b |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:20:00Z |
| publishDate | 2021-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-f6aa1b4fa6b74770990632172fa7632b2024-04-12T17:12:21ZengAmerican Physical SocietyPhysical Review Research2643-15642021-07-013303310110.1103/PhysRevResearch.3.033101Spin Hall effect in a spin-1 chiral semimetalKe TangYong-Chang LauKenji NawaZhenchao WenQingyi XiangHiroaki SukegawaTakeshi SekiYoshio MiuraKoki TakanashiSeiji MitaniThe spin-1 chiral semimetal is a state of quantum matter hosting unconventional chiral fermions that extend beyond the common Dirac and Weyl fermions. B20-type CoSi is a prototypal material that accommodates such an exotic quasiparticle. To date, the spin-transport properties in the spin-1 chiral semimetals have not been thoroughly explored. In this work, we fabricated B20-CoSi thin films on sapphire c-plane substrates by magnetron sputtering and studied the spin Hall effect (SHE) by combining experiments and first-principles calculations. The SHE of CoSi was investigated using CoSi/CoFeB/MgO heterostructures via spin Hall magnetoresistance and harmonic Hall measurements. First-principles calculations yield an intrinsic spin Hall conductivity (SHC) at the Fermi level that is consistent with the experiments and reveal its unique Fermi-energy dependence. Unlike the Dirac and Weyl fermion-mediated Hall conductivities that exhibit a peaklike structure centering around the topological node, SHC of B20-CoSi is odd and crosses zero at the node with two antisymmetric local extrema of opposite sign situated below and above in energy. Hybridization between Co d-Si p orbitals and spin-orbit coupling are essential for the SHC, despite the small (∼1%) weight of the Si p orbital near the Fermi level. This work expands the horizon of topological spintronics and highlights the importance of Fermi-level tuning in order to fully exploit the topology of spin-1 chiral fermions for spin-current generation.http://doi.org/10.1103/PhysRevResearch.3.033101 |
| spellingShingle | Ke Tang Yong-Chang Lau Kenji Nawa Zhenchao Wen Qingyi Xiang Hiroaki Sukegawa Takeshi Seki Yoshio Miura Koki Takanashi Seiji Mitani Spin Hall effect in a spin-1 chiral semimetal Physical Review Research |
| title | Spin Hall effect in a spin-1 chiral semimetal |
| title_full | Spin Hall effect in a spin-1 chiral semimetal |
| title_fullStr | Spin Hall effect in a spin-1 chiral semimetal |
| title_full_unstemmed | Spin Hall effect in a spin-1 chiral semimetal |
| title_short | Spin Hall effect in a spin-1 chiral semimetal |
| title_sort | spin hall effect in a spin 1 chiral semimetal |
| url | http://doi.org/10.1103/PhysRevResearch.3.033101 |
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