Fig. 3: Chirality switching of 1T-TaS2 during the temperature variation process.
From: Spectroscopic visualization and phase manipulation of chiral charge density waves in 1T-TaS2
a, b Raman intensity mapping images for the Eg5 mode of a multilayer 1T-TaS2 flake under a σ+ and b σ− excitation at 298 K. The dotted lines divide the flake into several parts with different thicknesses. c, d Raman intensity mapping images for the Eg5 mode of the chirality-reversed 1T-TaS2 under c σ+ and d σ− excitation after the annealing cycle. The wavelength of the excitation laser is 532 nm. e–g Schematics of e initial NCCDW phase at the temperature (T) of 298 K; f ICCDW phase with T > 350 K (normal phase above ~550 K); g chirality-reversed NCCDW phase at 298 K after the annealing process. The unit cells of the chiral superlattice are illustrated by the black rhombus.
