Ultrafast Modulations and Detection of a Ferro-Rotational Charge Density Wave Using Time-Resolved Electric Quadrupole Second Harmonic Generation

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...

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Bibliographic Details
Published in:Physical review letters 2021-09, Vol.127 (12), p.126401-126401, Article 126401
Main Authors: Luo, Xiangpeng, Obeysekera, Dimuthu, Won, Choongjae, Sung, Suk Hyun, Schnitzer, Noah, Hovden, Robert, Cheong, Sang-Wook, Yang, Junjie, Sun, Kai, Zhao, Liuyan
Format: Article
Language:English
Subjects:
Anisotropy
Charge density waves
Fluence
Quadrupoles
Rotation
Second harmonic generation
Temperature dependence
Time dependence
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.126401