"Spontaneous emission decay and excitation in photonic time crystals"
Jagang Park, Kyungmin Lee, Ruo-Yang Zhang, Hee-Chul Park, Jung-Wan Ryu, Gil Young Cho, Min Yeul Lee, Zhaoqing Zhang, Namkyoo Park, Wonju Jeon, Jonghwa Shin, C. T. Chan, Bumki Min, Physical Review Letters, 135, 133801