Electronic investigation on topological surface states of Bi0.9Sb0.1 Hwangho Lee, Kyung-Tae Ko, Byeong-Gyu Park, Seungseok Lee and Jae-Hoon Park EPL, 118 4 (2017) 47005 Published online: 21 July 2017 DOI: 10.1209/0295-5075/118/47005