Double band inversion in the topological phase transition of Ge1-x Snx alloys Rui Tan, Qirui Yang, Ruiyuan Chen, Yu Qiao, Shouqiao Tan, Yanqiang Cao, Peng Wang, Tai-Chang Chiang and Xiaoxiong Wang EPL, 133 5 (2021) 57001 Published online: 06 April 2021 DOI: 10.1209/0295-5075/133/57001