Photoinduced phase transitions in two-dimensional charge-density-wave 1T-TaS<sub>2</sub>

Photoinduced phase transitions in two-dimensional charge-density-wave 1T-TaS₂

Wen Wen^{1, 2}, Dang Chunhe^{1, 2}, Xie Liming^{1, 2, †}

The ultrafast optical pulse induced NC-to-IC phase transition of 1T-TaS₂ monitored by ultrafast electron diffraction. Real and reciprocal space representation of (a) NCCDW phase, and (b) ICCDW phase. Compared to the ICCDW with slight lattice distortion, the NCCDW phase consists of commensurate supercells, which exhibits ∼12°-rotated high-order diffraction peaks. (c) The evolution of NC and IC intensities under different excitation densities. This figure was reproduced from Ref. [25] with permission. Copyright 2016, American Physical Society.