Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO$_3$
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909140762230784 |
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| author | Kar, Uddipta Lu, Elisha Cho-Hao Singh, Akhilesh Kr. Reddy, P. V. Sreenivasa Han, Youngjoon Li, Xinwei Cheng, Cheng-Tung Yang, Song Lin, Chun-Yen Cheng, I-Chun Hsu, Chia-Hung Hsieh, D. Lee, Wei-Cheng Guo, Guang-Yu Lee, Wei-Li |
| author_facet | Kar, Uddipta Lu, Elisha Cho-Hao Singh, Akhilesh Kr. Reddy, P. V. Sreenivasa Han, Youngjoon Li, Xinwei Cheng, Cheng-Tung Yang, Song Lin, Chun-Yen Cheng, I-Chun Hsu, Chia-Hung Hsieh, D. Lee, Wei-Cheng Guo, Guang-Yu Lee, Wei-Li |
| contents | 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 sin$α$ dependence at low temperatures, where $α$ is the angle between bias current direction and orthorhombic [001]$_{\rm o}$, reaching a maximum when current is along orthorhombic [1-10]$_{\rm o}$. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]$_{\rm o}$, and it vanishes for bias current along [1-10]$_{\rm o}$. 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 [1-10]$_{\rm o}$ from surface states, accompanied by 1D chiral edge modes along [001]$_{\rm o}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_04482 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO$_3$ Kar, Uddipta Lu, Elisha Cho-Hao Singh, Akhilesh Kr. Reddy, P. V. Sreenivasa Han, Youngjoon Li, Xinwei Cheng, Cheng-Tung Yang, Song Lin, Chun-Yen Cheng, I-Chun Hsu, Chia-Hung Hsieh, D. Lee, Wei-Cheng Guo, Guang-Yu Lee, Wei-Li Mesoscale and Nanoscale Physics Materials Science 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 sin$α$ dependence at low temperatures, where $α$ is the angle between bias current direction and orthorhombic [001]$_{\rm o}$, reaching a maximum when current is along orthorhombic [1-10]$_{\rm o}$. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]$_{\rm o}$, and it vanishes for bias current along [1-10]$_{\rm o}$. 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 [1-10]$_{\rm o}$ from surface states, accompanied by 1D chiral edge modes along [001]$_{\rm o}$. |
| title | Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO$_3$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2307.04482 |