2021/03/31 by Xiangpeng Luo, Dimuthu Obeysekera, Choongjae Won +9 · 2 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Amplitude #Atomic physics #Charge density wave #Condensed matter physics #Laser #Materials science #Mechanical and Optical Resonators #Molecular physics #Optics #Photorefractive and Nonlinear Optics #Physics #Quadrupole #Rotation (mathematics) #Second-harmonic generation #Transient (computer programming) #Ultrashort pulse #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.127.126401
published in Physical Review Letters 127(12), 126401 (American Physical Society)
arxiv created 2021/06/06 · openalex publication_date 2021/09/13 · arxiv updated 2021/09/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We show the ferro-rotational nature of the commensurate charge density wave (CCDW) in 1T-TaS2 and track its dynamic modulations by temperature-dependent and time-resolved electric quadrupole rotation anisotropy-second harmonic generation (EQ RA-SHG), respectively. The ultrafast modulations manifest as the breathing and the rotation of the EQ RA-SHG patterns at three frequencies around the reported single CCDW amplitude mode frequency. A sudden shift of the triplet frequencies and a dramatic increase in the breathing and rotation magnitude further reveal a photoinduced transient CDW phase across a critical pump fluence of ∼0.5 mJ/cm2.