Emergence of Chern metal in a moiré Kondo lattice
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915348202127360 |
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| author | Zhao, Wenjin Tao, Zui Zhang, Yichi Shen, Bowen Han, Zhongdong Knüppel, Patrick Zeng, Yihang Xia, Zhengchao Watanabe, Kenji Taniguchi, Takashi Shan, Jie Mak, Kin Fai |
| author_facet | Zhao, Wenjin Tao, Zui Zhang, Yichi Shen, Bowen Han, Zhongdong Knüppel, Patrick Zeng, Yihang Xia, Zhengchao Watanabe, Kenji Taniguchi, Takashi Shan, Jie Mak, Kin Fai |
| contents | A Chern metal is a two-dimensional metallic state of matter carrying chiral edge states. It can emerge as a doped Chern insulator, but theoretical studies have also predicted its emergence near a Kondo breakdown separating a metallic chiral spin liquid and a heavy Fermi liquid in a frustrated lattice. To date, the latter exotic scenario has not been realized. Here, we report the observation of a Chern metal at the onset of the magnetic Kondo breakdown in a frustrated moiré Kondo lattice--angle-aligned MoTe2/WSe2 bilayers. The state is compressible and is manifested by a nearly quantized Hall resistance but a finite longitudinal resistance that arises from a bad metallic bulk. The state also separates an itinerant and a heavy Fermi liquid and appears far away from the band inversion critical point of the material, thus ruling out its origin from simply doping a Chern insulator. We demonstrate the presence of a chiral edge state by nonlocal transport measurements and current-induced quantum anomalous Hall breakdown. Magnetic circular dichroism measurements further reveal a magnetization plateau for the Chern metal before a metamagnetic transition at the Kondo breakdown. Our results open an opportunity for moiré engineering of exotic quantum phases of matter through the close interplay between band topology and Kondo interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_14063 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergence of Chern metal in a moiré Kondo lattice Zhao, Wenjin Tao, Zui Zhang, Yichi Shen, Bowen Han, Zhongdong Knüppel, Patrick Zeng, Yihang Xia, Zhengchao Watanabe, Kenji Taniguchi, Takashi Shan, Jie Mak, Kin Fai Strongly Correlated Electrons Mesoscale and Nanoscale Physics A Chern metal is a two-dimensional metallic state of matter carrying chiral edge states. It can emerge as a doped Chern insulator, but theoretical studies have also predicted its emergence near a Kondo breakdown separating a metallic chiral spin liquid and a heavy Fermi liquid in a frustrated lattice. To date, the latter exotic scenario has not been realized. Here, we report the observation of a Chern metal at the onset of the magnetic Kondo breakdown in a frustrated moiré Kondo lattice--angle-aligned MoTe2/WSe2 bilayers. The state is compressible and is manifested by a nearly quantized Hall resistance but a finite longitudinal resistance that arises from a bad metallic bulk. The state also separates an itinerant and a heavy Fermi liquid and appears far away from the band inversion critical point of the material, thus ruling out its origin from simply doping a Chern insulator. We demonstrate the presence of a chiral edge state by nonlocal transport measurements and current-induced quantum anomalous Hall breakdown. Magnetic circular dichroism measurements further reveal a magnetization plateau for the Chern metal before a metamagnetic transition at the Kondo breakdown. Our results open an opportunity for moiré engineering of exotic quantum phases of matter through the close interplay between band topology and Kondo interactions. |
| title | Emergence of Chern metal in a moiré Kondo lattice |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.14063 |