  Three-dimensional topological insulators (TIs) attract much attention due to
its topologically protected Dirac surface states. Doping into TIs or their
proximity with normal superconductors can promote the realization of
topological superconductivity(SC) and Majorana fermions with potential
applications in quantum computations. Here, an emergent superconductivity was
observed in local mesoscopic point-contacts on the topological insulator Bi2Se3
by applying a voltage pulse through the contacts, evidenced by the Andreev
reflection peak in the point-contact spectra and a visible resistance drop in
the four-probe electrical resistance measurements. More intriguingly, the
superconductivity can be erased with thermal cycles by warming up to high
temperatures (300 K) and induced again by the voltage pulse at the base
temperature (1.9 K), suggesting a significance for designing new types of
quantum devices. Nematic behaviour is also observed in the superconducting
state, similar to the case of CuxBi2Se3 as topological superconductor
candidates.
