Universal phase dynamics in VO2 switches revealed by ultrafast operando diffraction, A. Sood, X. Shen, Y. Shi, S. Kumar, S. J. Park, M. Zajac, Y. Sun, L. Q. Chen, S. Ramanathan, X. Wang, W. C. Chueh and A. M. Lindenberg, arXiv:2102.06013 (2021)