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, and Liuyan Zhao
Phys. Rev. Lett. 127, 126401 – Published 13 September 2021
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Abstract

We show the ferro-rotational nature of the commensurate charge density wave (CCDW) in 1TTaS2 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 0.5mJ/cm2.

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  • Received 2 February 2021
  • Revised 4 June 2021
  • Accepted 6 August 2021

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

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiangpeng Luo1, Dimuthu Obeysekera2, Choongjae Won3, Suk Hyun Sung4, Noah Schnitzer4, Robert Hovden4, Sang-Wook Cheong3,5, Junjie Yang2, Kai Sun1, and Liuyan Zhao1,*

  • 1Department of Physics, University of Michigan, 450 Church St, Ann Arbor, Michigan 48109, USA
  • 2Department of Physics, New Jersey Institute of Technology, 323 Dr Martin Luther King Jr Blvd, Newark, New Jersey 07102, USA
  • 3Laboratory for Pohang Emergent Materials, Pohang Accelerator Laboratory and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 4Department of Materials Sciences, University of Michigan, 2300 Hayward Street, Ann Arbor, Michigan 48109, USA
  • 5Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • *Corresponding author. lyzhao@umich.edu

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Issue

Vol. 127, Iss. 12 — 17 September 2021

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