  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.
