Synergistic chemical and optical switching of chiral symmetry breaking in 1T-TaS$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915941561925632 |
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| author | Qiu, Qingzheng Zhao, Mengxian Mankowsky, Roman Lemke, Henrik Till Zerdane, Serhane Sander, Mathias Tao, Zihao Li, Qizhi Zheng, Xiquan Zhang, Shilong Xiao, Qian Jiang, Xinyi Liu, Xin Huang, Shih-Wen Yang, Yang Meng, Sheng Peng, Yingying |
| author_facet | Qiu, Qingzheng Zhao, Mengxian Mankowsky, Roman Lemke, Henrik Till Zerdane, Serhane Sander, Mathias Tao, Zihao Li, Qizhi Zheng, Xiquan Zhang, Shilong Xiao, Qian Jiang, Xinyi Liu, Xin Huang, Shih-Wen Yang, Yang Meng, Sheng Peng, Yingying |
| contents | Optical control of symmetry-breaking quantum phases is a central goal in quantum materials, yet deterministic switching is often hindered by the stability of single-domain ground states. The chiral structure of the charge density wave (CDW) in 1T-TaS$_2$ provides a natural platform for such control, but the pristine material remains locked in a single chirality. Here we show that combining chemical doping with femtosecond optical excitation enables efficient direct and non-thermal switching of the chiral CDW state and reveal its microscopic mechanism. Ti substitution stabilizes a ground state with coexisting chiral domains, creating a tunable energy landscape for optical manipulation. Femtosecond photoexcitation then induces asymmetric and anisotropic switching from dominant to minority chiral domains, characterized by in-plane domain growth and a redistribution toward an achiral configuration. The switching occurs on a timescale comparable to a coherent phonon oscillation ($\sim$2 THz), revealing a phonon-mediated pathway that proceeds through a transient domain-wall state. Our work establishes a new paradigm for synergistic control of chiral order parameters using chemical and ultrafast optical tuning in quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22921 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Synergistic chemical and optical switching of chiral symmetry breaking in 1T-TaS$_2$ Qiu, Qingzheng Zhao, Mengxian Mankowsky, Roman Lemke, Henrik Till Zerdane, Serhane Sander, Mathias Tao, Zihao Li, Qizhi Zheng, Xiquan Zhang, Shilong Xiao, Qian Jiang, Xinyi Liu, Xin Huang, Shih-Wen Yang, Yang Meng, Sheng Peng, Yingying Strongly Correlated Electrons Optical control of symmetry-breaking quantum phases is a central goal in quantum materials, yet deterministic switching is often hindered by the stability of single-domain ground states. The chiral structure of the charge density wave (CDW) in 1T-TaS$_2$ provides a natural platform for such control, but the pristine material remains locked in a single chirality. Here we show that combining chemical doping with femtosecond optical excitation enables efficient direct and non-thermal switching of the chiral CDW state and reveal its microscopic mechanism. Ti substitution stabilizes a ground state with coexisting chiral domains, creating a tunable energy landscape for optical manipulation. Femtosecond photoexcitation then induces asymmetric and anisotropic switching from dominant to minority chiral domains, characterized by in-plane domain growth and a redistribution toward an achiral configuration. The switching occurs on a timescale comparable to a coherent phonon oscillation ($\sim$2 THz), revealing a phonon-mediated pathway that proceeds through a transient domain-wall state. Our work establishes a new paradigm for synergistic control of chiral order parameters using chemical and ultrafast optical tuning in quantum materials. |
| title | Synergistic chemical and optical switching of chiral symmetry breaking in 1T-TaS$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.22921 |