Abstract
Strong mid-infrared pulses are used to directly control the dynamics of the crystal lattice. In this paper, we studied the effects of Sb3+, Nb3+ and V3+ atom doping on the ferroelectric dynamics of cubic KTaO3 induced by mid-infrared light through the nonlinear coupling of phonon modes. We found that Nb3+ and V3+ doping cause the coupling constant l between the highest (Qhx) and lowest frequency phonon mode (Qlz) to be negative, which results in a softening of the Qlz mode when the Qhx mode is externally pumped; Sb3+ doping will increase the damping effect and inhibit the occurrence of KTaO3 light-induced ferroelectricity; and it is proved that the two different configurations of doped KTaO3 compounds can suppress or enhance the photo-induced ferroelectricity of KTaO3. KTaO3-defect-1 doped with V3+ can cause the light-induced ferroelectricity of KTaO3, but KTaO3-defect-2 doped with V3+ inhibited it. In short, our research results strongly support the idea of using atomic doping to control the photo-induced ferroelectricity of KTaO3, which provides an effective strategy for using the light-induced ferroelectricity in all-optical devices.
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