Electronic Nematicity Revealed by Polarized Ultrafast Spectroscopy in Bilayer La$_3$Ni$_2$O$_7$
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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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| author | Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Huo, Meng-Wu Liu, H. Y. Liu, Jun Duan, Yu-Xia Yao, Dao-Xin Wang, Meng Meng, Jian-Qiao |
| author_facet | Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Huo, Meng-Wu Liu, H. Y. Liu, Jun Duan, Yu-Xia Yao, Dao-Xin Wang, Meng Meng, Jian-Qiao |
| contents | We report a polarized ultrafast pump-probe study of the normal-state electronic dynamics in bilayer La$_3$Ni$_2$O$_7$ and trilayer La$_4$Ni$_3$O$_{10}$ single crystals at ambient pressure. While both nickelates exhibit density-wave (DW) transitions accompanied by the opening of a quasiparticle relaxation bottleneck, their electronic responses display strikingly different symmetry properties. La4Ni3O10 maintains an isotropic optical response across the entire temperature range. In contrast, La$_3$Ni$_2$O$_7$ exhibits a pronounced twofold ($C_2$) anisotropy in its lowtemperature electronic dynamics. This electronic nematicity, evident in both the relaxation dynamics and the polarization-dependent effective bottleneck energy scales, is strongly modified below 115 K, suggesting coupling or competition with a secondary DW-like instability reported by complementary probes. The presence of macroscopic electronic anisotropy in the bilayer system, and its absence in the trilayer system, suggests a possible relation between electronic nematic correlations and the superconducting normal state in a$_3$Ni$_2$O$_7$ that deserves further exploration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_01702 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic Nematicity Revealed by Polarized Ultrafast Spectroscopy in Bilayer La$_3$Ni$_2$O$_7$ Wu, Qi-Yi Hu, De-Yuan Zhang, Chen Liu, Hao Chen, Bo Zhou, Ying Fu, Zhong-Tuo Lv, Chun-Hui Xu, Zi-Jie Deng, Hai-Long Huo, Meng-Wu Liu, H. Y. Liu, Jun Duan, Yu-Xia Yao, Dao-Xin Wang, Meng Meng, Jian-Qiao Strongly Correlated Electrons Superconductivity We report a polarized ultrafast pump-probe study of the normal-state electronic dynamics in bilayer La$_3$Ni$_2$O$_7$ and trilayer La$_4$Ni$_3$O$_{10}$ single crystals at ambient pressure. While both nickelates exhibit density-wave (DW) transitions accompanied by the opening of a quasiparticle relaxation bottleneck, their electronic responses display strikingly different symmetry properties. La4Ni3O10 maintains an isotropic optical response across the entire temperature range. In contrast, La$_3$Ni$_2$O$_7$ exhibits a pronounced twofold ($C_2$) anisotropy in its lowtemperature electronic dynamics. This electronic nematicity, evident in both the relaxation dynamics and the polarization-dependent effective bottleneck energy scales, is strongly modified below 115 K, suggesting coupling or competition with a secondary DW-like instability reported by complementary probes. The presence of macroscopic electronic anisotropy in the bilayer system, and its absence in the trilayer system, suggests a possible relation between electronic nematic correlations and the superconducting normal state in a$_3$Ni$_2$O$_7$ that deserves further exploration. |
| title | Electronic Nematicity Revealed by Polarized Ultrafast Spectroscopy in Bilayer La$_3$Ni$_2$O$_7$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2601.01702 |