Experimental Demonstration of a Magnetically Induced Warping Transition in a Topological Insulator Mediated by Rare-Earth Surface Dopants - Cano, BM; Ferreiros, Y; Pantaleón, PA; Dai, J; Tallarida, M; Figueroa, AI; Marinova, V; García-Díez, K; Mugarza, A; Valenzuela, SO; Miranda, R; Camarero, J; et al. (Nano Letters, 2023)