Light-induced dimension crossover dictated by excitonic correlations

Yun Cheng, Alfred Zong, Jun Li, Wei Xia, Shaofeng Duan, Wenxuan Zhao, Yidian Li, Fengfeng Qi, Jun Wu, Lingrong Zhao, Pengfei Zhu, Xiao Zou, Tao Jiang, Yanfeng Guo, Lexian Yang, Dong Qian, Wentao Zhang, Anshul Kogar (), Michael W. Zuerch (), Dao Xiang () and Jie Zhang ()
Additional contact information
Yun Cheng: School of Physics and Astronomy, Shanghai Jiao Tong University
Alfred Zong: University of California at Berkeley
Jun Li: Institute of Physics, Chinese Academy of Sciences
Wei Xia: ShanghaiTech University
Shaofeng Duan: School of Physics and Astronomy, Shanghai Jiao Tong University
Wenxuan Zhao: Tsinghua University
Yidian Li: Tsinghua University
Fengfeng Qi: School of Physics and Astronomy, Shanghai Jiao Tong University
Jun Wu: School of Physics and Astronomy, Shanghai Jiao Tong University
Lingrong Zhao: School of Physics and Astronomy, Shanghai Jiao Tong University
Pengfei Zhu: School of Physics and Astronomy, Shanghai Jiao Tong University
Xiao Zou: School of Physics and Astronomy, Shanghai Jiao Tong University
Tao Jiang: School of Physics and Astronomy, Shanghai Jiao Tong University
Yanfeng Guo: ShanghaiTech University
Lexian Yang: Tsinghua University
Dong Qian: School of Physics and Astronomy, Shanghai Jiao Tong University
Wentao Zhang: School of Physics and Astronomy, Shanghai Jiao Tong University
Anshul Kogar: University of California at Los Angeles
Michael W. Zuerch: University of California at Berkeley
Dao Xiang: School of Physics and Astronomy, Shanghai Jiao Tong University
Jie Zhang: School of Physics and Astronomy, Shanghai Jiao Tong University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract In low-dimensional systems with strong electronic correlations, the application of an ultrashort laser pulse often yields novel phases that are otherwise inaccessible. The central challenge in understanding such phenomena is to determine how dimensionality and many-body correlations together govern the pathway of a non-adiabatic transition. To this end, we examine a layered compound, 1T-TiSe2, whose three-dimensional charge-density-wave (3D CDW) state also features exciton condensation due to strong electron-hole interactions. We find that photoexcitation suppresses the equilibrium 3D CDW while creating a nonequilibrium 2D CDW. Remarkably, the dimension reduction does not occur unless bound electron-hole pairs are broken. This relation suggests that excitonic correlations maintain the out-of-plane CDW coherence, settling a long-standing debate over their role in the CDW transition. Our findings demonstrate how optical manipulation of electronic interaction enables one to control the dimensionality of a broken-symmetry order, paving the way for realizing other emergent states in strongly correlated systems.

Date: 2022
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DOI: 10.1038/s41467-022-28309-5

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