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arXiv · 2603.22921

Chemical and optical control of chiral-domain dynamics in 1T-TaS$_2$

Qingzheng Qiu·Mengxian Zhao·Roman Mankowsky·Henrik Till Lemke·Serhane Zerdane·Mathias Sander·Zihao Tao·Qizhi Li·Xiquan Zheng·Shilong Zhang·Qian Xiao·Xinyi Jiang·Xin Liu·Shih-Wen Huang·Yang Yang·Sheng Meng·Yingying Peng
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Abstract

Optical control of symmetry-breaking quantum phases is often constrained when one domain is strongly favored in equilibrium. This limitation is exemplified by the chiral charge-density-wave (CDW) order in 1T-TaS$_2$, where pristine samples predominantly select a single chirality. Here we show that free-energy landscape engineering through Ti substitution enables a distinct nonthermal pathway for ultrafast chiral-domain redistribution. Ti doping stabilizes coexisting chiral domains and tunes their relative stability, allowing femtosecond excitation to drive an asymmetric and anisotropic redistribution from the dominant toward the minority chirality. The subpicosecond response follows a $\sim2$ THz amplitude mode and is consistent with a phonon-assisted pathway involving transient domain-wall configurations. Our results establish free-energy landscape engineering as a strategy for selecting nonequilibrium transition pathways.

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Qingzheng Qiu, Mengxian Zhao, Roman Mankowsky, Henrik Till Lemke, Serhane Zerdane, Mathias Sander, Zihao Tao, Qizhi Li, Xiquan Zheng, Shilong Zhang, Qian Xiao, Xinyi Jiang, Xin Liu, Shih-Wen Huang, Yang Yang, Sheng Meng, Yingying Peng. 2026-03-24. Chemical and optical control of chiral-domain dynamics in 1T-TaS$_2$. https://arxiv.org/abs/2603.22921

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