Fig. 3: Shift Current in NbOCl2.
From: Manipulation of nonlinear optical responses in layered ferroelectric niobium oxide dihalides
a–c Frequency-dependent shift current susceptibility tensor \({\sigma }^{{abb}}\), integrated shift vector \(e{\bar{R}}^{{ab}}\), and optical absorption spectrum \({\varepsilon }_{2}^{{ab}}\) induced by the y-polarized and x-polarized incident light, respectively. d, e Frequency-dependent \({\sigma }^{{yxx}}\) and \({\sigma }^{{yyy}}\) under uniaxial in-plane strains along the x or y direction, respectively. f Comparison of the peak A in \({\sigma }^{{yxx}}\) and peak B in \({\sigma }^{{yyy}}\) with different layer thicknesses in NbOCl2.
