Giant Berry curvature dipole density in a ferroelectric Weyl semimetal
Abstract The nonlinear Hall effect (NLHE) reflects Berry-curvature-related properties in non-centrosymmetric but time-reversal-symmetric materials. So far, the NLHE of the investigated systems remains a tiny effect due to the lack of Weyl point as magnetic monopoles in 2D systems or to the high carr...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2022-10-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-022-00512-z |
| _version_ | 1811182241074642944 |
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| author | Cheng-Long Zhang Tian Liang Yoshio Kaneko Naoto Nagaosa Yoshinori Tokura |
| author_facet | Cheng-Long Zhang Tian Liang Yoshio Kaneko Naoto Nagaosa Yoshinori Tokura |
| author_sort | Cheng-Long Zhang |
| collection | DOAJ |
| description | Abstract The nonlinear Hall effect (NLHE) reflects Berry-curvature-related properties in non-centrosymmetric but time-reversal-symmetric materials. So far, the NLHE of the investigated systems remains a tiny effect due to the lack of Weyl point as magnetic monopoles in 2D systems or to the high carrier concentration in 3D systems. Here, we report large NLHE due to gigantic Berry curvature dipole density as generated by tilted Weyl cones near the Fermi level in a model ferroelectric Weyl semimetal In-doped Pb1−x Sn x Te. By systematically lowering the carrier concentration down to ~1016 cm−3, the Berry curvature dipole density reaches values around 10−21 m3, 102–107 times higher than the previously reported ones. Furthermore, NLHE exhibits a power law of carrier concentration and follows the k −2 relation of the Berry curvature expression derived from the monopole. The present study establishes giant NLHE in a ferroelectric Weyl semimetal, promising for future applications such as current rectification. |
| first_indexed | 2024-04-11T09:29:14Z |
| format | Article |
| id | doaj.art-b9e24e262a6846d79982df27469f1358 |
| institution | Directory Open Access Journal |
| issn | 2397-4648 |
| language | English |
| last_indexed | 2024-04-11T09:29:14Z |
| publishDate | 2022-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj.art-b9e24e262a6846d79982df27469f13582022-12-22T04:31:56ZengNature Portfolionpj Quantum Materials2397-46482022-10-01711610.1038/s41535-022-00512-zGiant Berry curvature dipole density in a ferroelectric Weyl semimetalCheng-Long Zhang0Tian Liang1Yoshio Kaneko2Naoto Nagaosa3Yoshinori Tokura4RIKEN Center for Emergent Matter Science (CEMS)RIKEN Center for Emergent Matter Science (CEMS)RIKEN Center for Emergent Matter Science (CEMS)RIKEN Center for Emergent Matter Science (CEMS)RIKEN Center for Emergent Matter Science (CEMS)Abstract The nonlinear Hall effect (NLHE) reflects Berry-curvature-related properties in non-centrosymmetric but time-reversal-symmetric materials. So far, the NLHE of the investigated systems remains a tiny effect due to the lack of Weyl point as magnetic monopoles in 2D systems or to the high carrier concentration in 3D systems. Here, we report large NLHE due to gigantic Berry curvature dipole density as generated by tilted Weyl cones near the Fermi level in a model ferroelectric Weyl semimetal In-doped Pb1−x Sn x Te. By systematically lowering the carrier concentration down to ~1016 cm−3, the Berry curvature dipole density reaches values around 10−21 m3, 102–107 times higher than the previously reported ones. Furthermore, NLHE exhibits a power law of carrier concentration and follows the k −2 relation of the Berry curvature expression derived from the monopole. The present study establishes giant NLHE in a ferroelectric Weyl semimetal, promising for future applications such as current rectification.https://doi.org/10.1038/s41535-022-00512-z |
| spellingShingle | Cheng-Long Zhang Tian Liang Yoshio Kaneko Naoto Nagaosa Yoshinori Tokura Giant Berry curvature dipole density in a ferroelectric Weyl semimetal npj Quantum Materials |
| title | Giant Berry curvature dipole density in a ferroelectric Weyl semimetal |
| title_full | Giant Berry curvature dipole density in a ferroelectric Weyl semimetal |
| title_fullStr | Giant Berry curvature dipole density in a ferroelectric Weyl semimetal |
| title_full_unstemmed | Giant Berry curvature dipole density in a ferroelectric Weyl semimetal |
| title_short | Giant Berry curvature dipole density in a ferroelectric Weyl semimetal |
| title_sort | giant berry curvature dipole density in a ferroelectric weyl semimetal |
| url | https://doi.org/10.1038/s41535-022-00512-z |
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