Terahertz Emission from 
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 Thin Films Induced by Excitation with Circularly Polarized Light

Hirai, Yoshua; Yoshikawa, Norishige; Hirose, Hana; Kawaguchi, Masashi; Hayashi, Masamitsu; Shimano, Ryo

doi:10.1103/physrevapplied.14.064015

Cited by 16 publications

(2 citation statements)

References 35 publications

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“…This unique ultrafast SCC process may also occur with other optical spin‐injection methods, such as using circularly‐polarized light without a ferromagnetic layer. [ 40 , 41 , 42 ] Therefore, when investigating the SCC of topological materials via optical spin‐injection methods, it should be interpreted in terms of the ultrafast SCC (i.e., considering the decay process of the spin‐polarized hot electrons). Despite the significant potential of Bi 1− x Sb x in spintronic applications, the source of the giant spin Hall angle has been unclear.…”

Section: Discussionmentioning

confidence: 99%

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

et al. 2022

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Topological materials have significant potential for spintronic applications owing to their superior spin-charge interconversion. Here, the spin-to-charge conversion (SCC) characteristics of epitaxial Bi 1−x Sb x films is investigated across the topological phase transition by spintronic terahertz (THz) spectroscopy. An unexpected, intense spintronic THz emission is observed in the topologically nontrivial semimetal Bi 1−x Sb x films, significantly greater than that of Pt and Bi 2 Se 3 , which indicates the potential of Bi 1−x Sb x for spintronic applications. More importantly, the topological surface state (TSS) is observed to significantly contribute to SCC, despite the coexistence of the bulk state, which is possible via a unique ultrafast SCC process, considering the decay process of the spin-polarized hot electrons. This means that topological material-based spintronic devices should be fabricated in a manner that fully utilizes the TSS, not the bulk state, to maximize their performance. The results not only provide a clue for identifying the source of the giant spin Hall angle of Bi 1−x Sb x , but also expand the application potential of topological materials by indicating that the optically induced spin current provides a unique method for focused-spin injection into the TSS.

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Section: Discussionmentioning

confidence: 99%

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

et al. 2022

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“…[17][18][19][20] For instance, it is shown that in Pt/Co/Ta multilayers, anisotropic DMI and in-plane anisotropy deform magnetic skyrmions to elliptical shapes. [19] Although bismuth is a remarkable material with strong spin-orbit coupling, [39] the DMI is considered weak in our Bi-YIG sample. The lattice structure of YIG is centrosymmetric, where bulk DMI is not significant.…”

Section: Magnetic Bubble Morphologiesmentioning

confidence: 98%

Magnetic triangular bubble lattices in bismuth-doped yttrium iron garnet

et al. 2023

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Magnetic bubbles have again become a subject of significant attention following the experimental observation of topologically nontrivial magnetic skyrmions. In recent work, tailoring the shape of the bubbles is considered a key factor for their dynamics in spintronic devices. In addition to the reported circular, elliptical, and square bubbles, here we observe triangular bubble domains in bismuth-doped yttrium iron garnet (Bi-YIG) using Kerr microscopy. The bubble domains evolve from discrete circular to latticed triangular and hexagonal shapes. Further, the orientation of the triangular bubbles in the hexagonal lattices can be flipped by decreasing the magnetic field. The sixfold in-plane magnetic anisotropy of Bi-YIG(111) crystal, which is presumably the mechanism underlying the triangular shape of the bubbles, is measured as 1179 erg/cm3. The study of the morphologies of topologically trivial bubbles in YIG offers insight into nontrivial spin textures, which is appealing for future spintronic applications.

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Ultrafast Drift Current Terahertz Emission Amplification in the Monolayer WSe₂/Si Heterostructure

Song

Zhang

et al. 2022

J. Phys. Chem. Lett.

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Terahertz Emission from Bismuth Thin Films Induced by Excitation with Circularly Polarized Light

Cited by 16 publications

References 35 publications

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

Magnetic triangular bubble lattices in bismuth-doped yttrium iron garnet

Ultrafast Drift Current Terahertz Emission Amplification in the Monolayer WSe₂/Si Heterostructure

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Terahertz Emission from Bismuth Thin Films Induced by Excitation with Circularly Polarized Light

Cited by 16 publications

References 35 publications

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi1−xSbx Films

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi1−xSbx Films

Magnetic triangular bubble lattices in bismuth-doped yttrium iron garnet

Ultrafast Drift Current Terahertz Emission Amplification in the Monolayer WSe2/Si Heterostructure

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Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi₁₋_xSb_x Films

Ultrafast Drift Current Terahertz Emission Amplification in the Monolayer WSe₂/Si Heterostructure