Corrigendum: Effective velocities of polaron spin states in monolayer transition metal dichalcogenides (2021 J. Phys.: Condens. Matter33 235303). (30th July 2021) - Sun, Yong; Ma, Xu-Fei; Liu, Xiao-Yi; Cui, Yu; Deng, Jia-Pei; Xiao, Yao; Li, Zhi-Qing; Wang, Zi-Wu