Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3}
The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-02-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.14.011022 |
| _version_ | 1797302042780237824 |
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| author | Uddipta Kar Elisha Cho-Hao Lu Akhilesh Kr. Singh P. V. Sreenivasa Reddy Youngjoon Han Xinwei Li Cheng-Tung Cheng Song Yang Chun-Yen Lin I-Chun Cheng Chia-Hung Hsu David Hsieh Wei-Cheng Lee Guang-Yu Guo Wei-Li Lee |
| author_facet | Uddipta Kar Elisha Cho-Hao Lu Akhilesh Kr. Singh P. V. Sreenivasa Reddy Youngjoon Han Xinwei Li Cheng-Tung Cheng Song Yang Chun-Yen Lin I-Chun Cheng Chia-Hung Hsu David Hsieh Wei-Cheng Lee Guang-Yu Guo Wei-Li Lee |
| author_sort | Uddipta Kar |
| collection | DOAJ |
| description | The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative longitudinal magnetoresistance due to chiral anomaly effect and unusual thickness dependent quantum oscillation from Weyl-orbit effect, which were demonstrated recently in experiments. In this work, we report the experimental observations of large nonlinear and nonreciprocal transport effects for both longitudinal and transverse channels in an untwinned Weyl metal of SrRuO_{3} thin film grown on a SrTiO_{3} substrate. From rigorous measurements with bias current applied along various directions with respect to the crystalline principal axes, the magnitude of nonlinear Hall signals from the transverse channel exhibits a simple sinα dependence at low temperatures, where α is the angle between bias current direction and orthorhombic [001]_{o}, reaching a maximum when current is along orthorhombic [11[over ¯]0]_{o}. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]_{o}, and it vanishes for bias current along [11[over ¯]0]_{o}. The observed α-dependent nonlinear and nonreciprocal signals in longitudinal and transverse channels reveal a magnetic Weyl phase with an effective Berry curvature dipole along [11[over ¯]0]_{o} from surface states, accompanied by 1D chiral edge modes along [001]_{o}. |
| first_indexed | 2024-03-07T23:31:09Z |
| format | Article |
| id | doaj.art-f5d567a6ee114df880dc11d0083c884e |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-03-07T23:31:09Z |
| publishDate | 2024-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-f5d567a6ee114df880dc11d0083c884e2024-02-20T15:14:13ZengAmerican Physical SocietyPhysical Review X2160-33082024-02-0114101102210.1103/PhysRevX.14.011022Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3}Uddipta KarElisha Cho-Hao LuAkhilesh Kr. SinghP. V. Sreenivasa ReddyYoungjoon HanXinwei LiCheng-Tung ChengSong YangChun-Yen LinI-Chun ChengChia-Hung HsuDavid HsiehWei-Cheng LeeGuang-Yu GuoWei-Li LeeThe identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative longitudinal magnetoresistance due to chiral anomaly effect and unusual thickness dependent quantum oscillation from Weyl-orbit effect, which were demonstrated recently in experiments. In this work, we report the experimental observations of large nonlinear and nonreciprocal transport effects for both longitudinal and transverse channels in an untwinned Weyl metal of SrRuO_{3} thin film grown on a SrTiO_{3} substrate. From rigorous measurements with bias current applied along various directions with respect to the crystalline principal axes, the magnitude of nonlinear Hall signals from the transverse channel exhibits a simple sinα dependence at low temperatures, where α is the angle between bias current direction and orthorhombic [001]_{o}, reaching a maximum when current is along orthorhombic [11[over ¯]0]_{o}. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]_{o}, and it vanishes for bias current along [11[over ¯]0]_{o}. The observed α-dependent nonlinear and nonreciprocal signals in longitudinal and transverse channels reveal a magnetic Weyl phase with an effective Berry curvature dipole along [11[over ¯]0]_{o} from surface states, accompanied by 1D chiral edge modes along [001]_{o}.http://doi.org/10.1103/PhysRevX.14.011022 |
| spellingShingle | Uddipta Kar Elisha Cho-Hao Lu Akhilesh Kr. Singh P. V. Sreenivasa Reddy Youngjoon Han Xinwei Li Cheng-Tung Cheng Song Yang Chun-Yen Lin I-Chun Cheng Chia-Hung Hsu David Hsieh Wei-Cheng Lee Guang-Yu Guo Wei-Li Lee Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} Physical Review X |
| title | Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} |
| title_full | Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} |
| title_fullStr | Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} |
| title_full_unstemmed | Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} |
| title_short | Nonlinear and Nonreciprocal Transport Effects in Untwinned Thin Films of Ferromagnetic Weyl Metal SrRuO_{3} |
| title_sort | nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic weyl metal srruo 3 |
| url | http://doi.org/10.1103/PhysRevX.14.011022 |
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