Ultrafast Optical Evidence of Coexisting Density Waves in Bilayer Nickelate La$_3$Ni$_2$O$_7$
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918229453045760 |
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| author | Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Huo, Mengwu Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Liu, H. Y. Liu, Jun Duan, Yu-Xia Wang, Meng Meng, Jian-Qiao |
| author_facet | Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Huo, Mengwu Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Liu, H. Y. Liu, Jun Duan, Yu-Xia Wang, Meng Meng, Jian-Qiao |
| contents | Utilizing ultrafast optical pump-probe spectroscopy, we investigate the coexistence and competition of electronic orders in the bilayer nickelate La$_3$Ni$_2$O$_7$. Our results reveal two coexisting density waves that can be selectively manipulated with light. We directly identify a spin-density wave (SDW) with electronic nematicity emerging below $T_{\rm SDW}$ $\approx$ 140 K by measuring its spin dynamics, and discover a distinct, nonmagnetic charge order appearing below $T_{\rm DW}$ $\approx$ 115 K. The central finding is the demonstration of differential optical control: the charge order is fragile, completely suppressed by a pump fluence of approximately 40 $μ$J/cm$^2$, while the SDW is remarkably robust, persisting to 200 $μ$J/cm$^2$. This work establishes a clear hierarchy in the stability of competing electronic orders and provides a powerful method for disentangling their interplay in quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_09436 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrafast Optical Evidence of Coexisting Density Waves in Bilayer Nickelate La$_3$Ni$_2$O$_7$ Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Huo, Mengwu Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Liu, H. Y. Liu, Jun Duan, Yu-Xia Wang, Meng Meng, Jian-Qiao Strongly Correlated Electrons Superconductivity Utilizing ultrafast optical pump-probe spectroscopy, we investigate the coexistence and competition of electronic orders in the bilayer nickelate La$_3$Ni$_2$O$_7$. Our results reveal two coexisting density waves that can be selectively manipulated with light. We directly identify a spin-density wave (SDW) with electronic nematicity emerging below $T_{\rm SDW}$ $\approx$ 140 K by measuring its spin dynamics, and discover a distinct, nonmagnetic charge order appearing below $T_{\rm DW}$ $\approx$ 115 K. The central finding is the demonstration of differential optical control: the charge order is fragile, completely suppressed by a pump fluence of approximately 40 $μ$J/cm$^2$, while the SDW is remarkably robust, persisting to 200 $μ$J/cm$^2$. This work establishes a clear hierarchy in the stability of competing electronic orders and provides a powerful method for disentangling their interplay in quantum materials. |
| title | Ultrafast Optical Evidence of Coexisting Density Waves in Bilayer Nickelate La$_3$Ni$_2$O$_7$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2508.09436 |