Zero-Point Motion of Polar Optical Phonons Revealed by Up-Converted Photoluminescence from a Single Perovskite Nanocrystal at Cryogenic TemperaturesRemoveRentong Duan, Fengrui Hu, Chunyang Yin, Yan Lv, Chunfeng Zhang, Min Xiao, Zhi-Gang Yu, and Xiaoyong WangPhys. Rev. Lett. 135, 196901 (2025)
