Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi <sub>2</sub> Sr <sub>2</sub> LaCuO <sub>6+δ</sub>
Jiemin Li, Abhishek Nag, Jonathan Pelliciari, H. C. Robarts, A. C. Walters, Mirian García‐Fernández, Hiroshi Eisaki, Dongjoon Song, Hong Ding, Steven Johnston, Riccardo Comin, Ke‐Jin Zhou
Abstract
Significance Charge-density waves (CDWs) are a ubiquitous form of electron density modulation in cuprate superconductors. Unveiling the nature of quasistatic CDWs and their dynamical excitations is crucial for understanding their origin––similar to the study of antiferromagnetism in cuprates. However, dynamical CDW excitations remain largely unexplored due to the limited availability of suitable experimental probes. Here, using resonant inelastic X-ray scattering, we observe dynamical CDW excitations in Bi 2 Sr 2 LaCuO 6+δ (Bi2201) superconductors through its interference with the lattice. The distinct anomalies of the bond-buckling and the bond-stretching phonons allow us to draw a clear picture of funnel-shaped dynamical CDW excitations in Bi2201. Our results of the interplay between CDWs and the phonon anomalies shed light on the nature of CDWs in cuprates.