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, Suk Hyun Sung, Noah Schnitzer, Robert Hovden, Sang Wook Cheong, Junjie Yang, Kai Sun, Liuyan Zhao

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number126401
JournalPhysical Review Letters
Volume127
Issue number12
DOIs
StatePublished - Sep 17 2021

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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