Ultrafast Modulations and Detection of a Ferro-Rotational Charge Density Wave Using Time-Resolved Electric Quadrupole Second Harmonic Generation.
作者信息
Luo Xiangpeng, Obeysekera Dimuthu, Won Choongjae, Sung Suk Hyun, Schnitzer Noah, Hovden Robert, Cheong Sang-Wook, Yang Junjie, Sun Kai, Zhao Liuyan
机构信息
Department of Physics, University of Michigan, 450 Church St, Ann Arbor, Michigan 48109, USA.
Department of Physics, New Jersey Institute of Technology, 323 Dr Martin Luther King Jr Blvd, Newark, New Jersey 07102, USA.
出版信息
Phys Rev Lett. 2021 Sep 17;127(12):126401. doi: 10.1103/PhysRevLett.127.126401.
We show the ferro-rotational nature of the commensurate charge density wave (CCDW) in 1T-TaS_{2} 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/cm^{2}.
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