Interplay between Mixed and Pure Exciton States Controls Singlet Fission in Rubrene Single Crystals - Dmitry R. Maslennikov; Marios Maimaris; Haoqing Ning; Xijia Zheng; Navendu Mondal; Vladimir V. Bruevich; Saied Md Pratik; Yifan Dong; John W. G. Tisch; Andrew J. Musser; Vitaly Podzorov; Jean-Luc Bredas; et al. (Journal of the American Chemical Society, 2025)