Ultrafast optical evidence of coexisting density waves in bilayer nickelate La3Ni2O7
Qi-Yi Wu, De-Yuan Hu, Chen Zhang, Mengwu Huo, Hao Liu, Bo Chen, Ying Zhou, Zhong-Tuo Fu, Chun-Hui Lv, Zi-Jie Xu, Hai-Long Deng, H. Y. Liu, Jun Liu, Yu-Xia Duan, Meng Wang, Jian-Qiao Meng
DOI 10.1103/j6hl-t2sh · Physical Review B
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Abstract
Utilizing ultrafast optical pump-probe spectroscopy, we investigate the coexistence and competition of electronic orders in the bilayer nickelate La3Ni2O7. 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 TSDW ≈140 K by measuring its spin dynamics, and discover a distinct, nonmagnetic charge order appearing below TDW ≈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 µJ/cm2, while the SDW is remarkably robust, persisting to 200 µJ/cm2. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | 14 GPa | unknown |
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