Extrinsic and Intrinsic Nonlinear Hall Effects across Berry-Dipole Transitions
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2022
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| Acceso en línea: | |
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| _version_ | 1866908504758943744 |
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| author | Zhuang, Zheng-Yang Yan, Zhongbo |
| author_facet | Zhuang, Zheng-Yang Yan, Zhongbo |
| contents | Three-dimensional Hopf insulators are a class of topological phases beyond the tenfold-way classification. The critical point separating two rotation-invariant Hopf insulator phases with distinct Hopf invariants is quite different from the usual Dirac-type or Weyl-type critical points and uniquely characterized by a quantized Berry dipole. Close to such Berry-dipole transitions, we find that the extrinsic and intrinsic nonlinear Hall conductivity tensors in the weakly doped regime are characterized by two universal functions of the ratio between doping level and bulk energy gap, and are directly proportional to the change in Hopf invariant across the transition. Our work suggests that the nonlinear Hall effects display a general-sense quantized behavior across Berry-dipole transitions, establishing a correspondence between nonlinear Hall effects and Hopf invariant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_02972 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Extrinsic and Intrinsic Nonlinear Hall Effects across Berry-Dipole Transitions Zhuang, Zheng-Yang Yan, Zhongbo Mesoscale and Nanoscale Physics Materials Science Quantum Gases Applied Physics Quantum Physics Three-dimensional Hopf insulators are a class of topological phases beyond the tenfold-way classification. The critical point separating two rotation-invariant Hopf insulator phases with distinct Hopf invariants is quite different from the usual Dirac-type or Weyl-type critical points and uniquely characterized by a quantized Berry dipole. Close to such Berry-dipole transitions, we find that the extrinsic and intrinsic nonlinear Hall conductivity tensors in the weakly doped regime are characterized by two universal functions of the ratio between doping level and bulk energy gap, and are directly proportional to the change in Hopf invariant across the transition. Our work suggests that the nonlinear Hall effects display a general-sense quantized behavior across Berry-dipole transitions, establishing a correspondence between nonlinear Hall effects and Hopf invariant. |
| title | Extrinsic and Intrinsic Nonlinear Hall Effects across Berry-Dipole Transitions |
| topic | Mesoscale and Nanoscale Physics Materials Science Quantum Gases Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2208.02972 |