Coherent Phonon Pairs and Rotational Symmetry Breaking of Charge Density Wave Order in the Kagome Superconductor CsV${}_3$Sb${}_5$

Qinwen Deng, Hengxin Tan, Brenden R. Ortiz +4

In this work, we perform ultrafast time-resolved reflectivity measurements to study the symmetry breaking in the charge-density wave (CDW) phase of CsV${}_3$Sb${}_5$. By extracting the…