Fig. 4: Numerical simulation of the SHG response of Te.
From: Topologically enhanced giant broadband second-harmonic generation in Weyl semiconductor tellurium
a Comparison of the experimentally extracted \({\chi }^{(2)}\) and theoretically calculated \({\chi }^{(2)}\) of undoped Te as a function of SH energy. The blue, purple, and gray curves correspond to the theoretical results from this work, ref. 25, and ref. 26, respectively, while experimental points are illustrated with gray circles. b Comparison of the experimentally extracted \({\chi }^{(2)}\) and the theoretically calculated \({\chi }^{(2)}\) of Te at different Fermi levels. c Comparison of theoretically calculated \({\chi }^{(2)}\) with and without corrections for relaxation time in the high-energy range. d–f k-resolved SHG in the reciprocal plane surrounded by HKML for different SH photon energies 2ℏω = 0.78 eV (d), 1.12 eV (e), and 1.34 eV (f). Color scale indicates the absolute values of the symmetrized contribution to SHG (see Methods for details) at each k-point, the horizontal and vertical axes are along the L-H and K-H directions, respectively.
