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

Document Type

Article

Publication Date

9-17-2021

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.

Identifier

85115313578 (Scopus)

Publication Title

Physical Review Letters

External Full Text Location

https://doi.org/10.1103/PhysRevLett.127.126401

e-ISSN

10797114

ISSN

00319007

PubMed ID

34597104

Issue

12

Volume

127

Grant

1741618

Fund Ref

National Research Foundation of Korea

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