Ultrafast Modulations And Detection of a Ferro-rotational Charge Density Wave Using Time-resolved Electric Quadrupole Second Harmonic Generation

Xiangpeng Luo, Dimuthu Obeysekera, Choongjae Won +7

We show the ferro-rotational nature of the commensurate charge density wave (CCDW) in $1T$-${\mathrm{TaS}}_2$ and track its dynamic modulations by temperature-dependent and time-reso…