Fig. 5: NLO Properties of Monolayer NbOX2.
From: Manipulation of nonlinear optical responses in layered ferroelectric niobium oxide dihalides
a Intensity of peak B in NbOX2 with X changing from Cl to I. Feature of peak B is marked in Fig. 2b. b Intensities of peak A in \({\sigma }^{{yxx}}\) and peak B in \({\sigma }^{{yyy}}\) with X changing from Cl to I in NbOX2. Features of peaks A and B are marked in Fig. 3a. c k-resolved optical transition rate for peak A (upper panel) and shift vector for peak B (bottom panel) for monolayer NbOX2.
