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

doi:10.1103/PhysRevLett.127.126401

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

Physics

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12 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 language	English (US)
Article number	126401
Journal	Physical Review Letters
Volume	127
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.127.126401
State	Published - Sep 17 2021

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.127.126401

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

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.",

author = "Xiangpeng Luo and Dimuthu Obeysekera and Choongjae Won and Sung, {Suk Hyun} and Noah Schnitzer and Robert Hovden and Cheong, {Sang Wook} and Junjie Yang and Kai Sun and Liuyan Zhao",

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doi = "10.1103/PhysRevLett.127.126401",

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T1 - Ultrafast Modulations and Detection of a Ferro-Rotational Charge Density Wave Using Time-Resolved Electric Quadrupole Second Harmonic Generation

AU - Luo, Xiangpeng

AU - Obeysekera, Dimuthu

AU - Won, Choongjae

AU - Sung, Suk Hyun

AU - Schnitzer, Noah

AU - Hovden, Robert

AU - Cheong, Sang Wook

AU - Yang, Junjie

AU - Sun, Kai

AU - Zhao, Liuyan

PY - 2021/9/17

Y1 - 2021/9/17

N2 - 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.

AB - 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.

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

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