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

نویسندگان

چکیده

We show the ferro-rotational nature of commensurate charge density wave (CCDW) in $1T$-$\mathrm{TaS}_2$ and track its dynamic modulations by temperature-dependent time-resolved electric quadrupole rotation anisotropy-second harmonic generation (EQ RA-SHG), respectively. The ultrafast manifest as breathing EQ RA-SHG patterns at three frequencies around reported single CCDW amplitude mode frequency. A sudden shift triplet a dramatic increase magnitude further reveal photo-induced transient CDW phase across critical pump fluence ~ 0.5 mJ/cm$^2$.

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ژورنال

عنوان ژورنال: Physical Review Letters

سال: 2021

ISSN: ['1079-7114', '0031-9007', '1092-0145']

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