Zhao Yun-Jin, Tian Meng, Huang Yong-Gang, Wang Xiao-Yun, Yang Hong, Mi Xian-Wu. Renormalization of photon dyadic Green function by finite element method and its applications in the study of spontaneous emission rate and energy level shiftJ. Acta Physica Sinica, 2018, 67(19): 193102. DOI: 10.7498/aps.67.20180898