Figure 2 | Colossal THG anisotropy and its mechanism. (IMAGE)
Caption
Figure 2 | Colossal THG anisotropy and its mechanism. a and b, angle-dependent THG spectra under excitation polarization at 1558 nm. 0° corresponds to the direction along the x-axis. Red (blue) spots represent the x (y)-component of the THG signal, respectively. The solid lines correspond to theoretical fitting curves, indicating the giant THG anisotropy. c, THG anisotropic ratio as a function of excitation wavelength for a few-layer VOCl flake. d, comparison of THG anisotropic ratios for VOCl and other materials. e, the transition dipole moments of the x- and y-components. The light blue shaded regions indicate the optical transitions that contribute to the THG around 1200nm. f, the optical transitions contributing to the THG anisotropic ratio peak located around the X, Y, U and T high symmetry k-point, as indicated by red arrows, and corresponding to the transition vector labeled in (e). g, the charge populations of the ground state and excited state on V, O and Cl atoms.
Credit
Zheng Liu et al.
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