Discovery of parity-violating chiral polar-nematic charge density wave and superconductivity in kagome metals
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917429357051904 |
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| author | Shi, Xingwei Li, Geng Wang, Zhan Zhang, Chuqi Zhu, Ke Zeng, Keyu Tang, Zikun Huang, Li Zhao, Zhen Sun, Jianping Liu, Xiao Cheng, Jin-Guang Shen, Chengmin Lau, Shu Ping Loh, Kian Ping Yang, Haitao Lin, Xiao Wang, Ziqiang Gao, Hong-Jun |
| author_facet | Shi, Xingwei Li, Geng Wang, Zhan Zhang, Chuqi Zhu, Ke Zeng, Keyu Tang, Zikun Huang, Li Zhao, Zhen Sun, Jianping Liu, Xiao Cheng, Jin-Guang Shen, Chengmin Lau, Shu Ping Loh, Kian Ping Yang, Haitao Lin, Xiao Wang, Ziqiang Gao, Hong-Jun |
| contents | Nonmagnetic kagome metals and superconductors AV3Sb5 (A = K, Rb, Cs) host unconventional charge density wave (CDW) and superconducting (SC) phases accompanied by multiple electronic symmetry breaking. Due to the centrosymmetric crystal structure, inversion symmetry has generally been assumed to hold. Here, using scanning tunneling microscopy complemented by atomic force microscopy and optical second-harmonic generation, we directly reveal that inversion symmetry in the kagome plane is spontaneously broken in the CDW state. The mixed-parity CDW state exhibits ferroelectric dipolar and nematic quadrupolar ordered moments. The coexistence and coupling between the dipole and quadrupole favor noncollinear ferro-polar and nematic alignment that breaks all mirror symmetries and gives rise to robust electronic chirality in the 3Q CDW. The multipolar coupling to in-plane electric field enables electric field control and manipulation of the chiral polar-nematic CDW state, including its chirality. Below the SC transition, we observe parity-violating pair density modulations at both the original and the CDW lattice wavevectors. Our findings of parity-violating electronic chiral multipolar order provide microscopic insights into the magnetoelectric and nonreciprocal transport, loop current order, pairing density waves, and unconventional superconductivity in kagome metals and related quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_20546 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Discovery of parity-violating chiral polar-nematic charge density wave and superconductivity in kagome metals Shi, Xingwei Li, Geng Wang, Zhan Zhang, Chuqi Zhu, Ke Zeng, Keyu Tang, Zikun Huang, Li Zhao, Zhen Sun, Jianping Liu, Xiao Cheng, Jin-Guang Shen, Chengmin Lau, Shu Ping Loh, Kian Ping Yang, Haitao Lin, Xiao Wang, Ziqiang Gao, Hong-Jun Superconductivity Nonmagnetic kagome metals and superconductors AV3Sb5 (A = K, Rb, Cs) host unconventional charge density wave (CDW) and superconducting (SC) phases accompanied by multiple electronic symmetry breaking. Due to the centrosymmetric crystal structure, inversion symmetry has generally been assumed to hold. Here, using scanning tunneling microscopy complemented by atomic force microscopy and optical second-harmonic generation, we directly reveal that inversion symmetry in the kagome plane is spontaneously broken in the CDW state. The mixed-parity CDW state exhibits ferroelectric dipolar and nematic quadrupolar ordered moments. The coexistence and coupling between the dipole and quadrupole favor noncollinear ferro-polar and nematic alignment that breaks all mirror symmetries and gives rise to robust electronic chirality in the 3Q CDW. The multipolar coupling to in-plane electric field enables electric field control and manipulation of the chiral polar-nematic CDW state, including its chirality. Below the SC transition, we observe parity-violating pair density modulations at both the original and the CDW lattice wavevectors. Our findings of parity-violating electronic chiral multipolar order provide microscopic insights into the magnetoelectric and nonreciprocal transport, loop current order, pairing density waves, and unconventional superconductivity in kagome metals and related quantum materials. |
| title | Discovery of parity-violating chiral polar-nematic charge density wave and superconductivity in kagome metals |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2604.20546 |