Mechanical Twisting-Induced Enhancement of Second-Order Optical Nonlinearity in a Flexible Molecular Crystal - Zhihua Wang; Wenqing Han; Bona Fu; Hanwen Kang; Puxin Cheng; Junjie Guan; Yongshen Zheng; Rongchao Shi; Jialiang Xu; Xian-He Bu (Journal of the American Chemical Society, 2025)