Proximity-effect-induced superconductivity in topological   insulator-related material Bi2Se3
  We have studied the electron transport properties of topological insulator-related material Bi2Se3 near the superconducting Pb-Bi2Se3 interface, and found that a superconducting state is induced over an extended volume in Bi2Se3. This state can carry a Josephson supercurrent, and demonstrates a gap-like structure in the conductance spectra as probed by a normal-metal electrode. The establishment of the gap is not by confining the electrons into a narrow space close to the superconductor-normal metal interface, as previously observed in other systems, but presumably via electron-electron attractive interaction in Bi2Se3. 
Fan Yang, Fanming Qu, Jie Shen, Yue Ding, Jun Chen, Zhongqing Ji,   Guangtong Liu, Jie Fan, Changli Yang, Liang Fu, and Li Lu
cond-mat.supr-con cond-mat.mes-hall