Effects of impurity adsorption on topological surface states of Bi2Te3 Khaqan Shati, M. Arshad Farhan, S. Selva Chandrasekaran, Ji Hoon Shim and Geunsik Lee EPL, 119 4 (2017) 47001 Published online: 26 October 2017 DOI: 10.1209/0295-5075/119/47001