Ambipolar field effect in the ternary topological insulator (Bi(x)Sb(1-x))2Te3 by composition tuning. by Kong, D, Chen, Y, Cha, J, Zhang, Q, Analytis, J, Lai, K, Liu, Z, Hong, S, Koski, K, Mo, S, Hussain, Z, Fisher, I, Shen, Z, Cui, Y