Origin of Pressure-Induced Nonlinear Optical Property Enhancement in CsGeCl3 Perovskite: [GeCl6] Octahedron Distortion and Band Gap Closing - Jia Qu; Yiming Wang; Zhongyang Li; Mingtao Li; Tianyao Pei; Nana Li; Dequan Jiang; Bin Yang; Bing Li; Meiyan Ye; Pinwen Zhu; Yonggang Wang; et al. (Journal of the American Chemical Society, 2025)