Superconductivity and chiral superconducting transport in WS2 nanotube

We will report the first observation of superconductivity in individual nanotube of tungsten disulfide realized by electrochemical doping. We will also report the exotic nonreciprocity in superconducting transport originating from tube chirality, in which the forward and backward supercurrent flows are inequivalent due to inversion symmetry breaking. The nonreciprocal signal is significantly enhanced at low temperature reflecting the coherence of superconducting state, and simultaneously displays the periodic quantum oscillations associated with the Little-Parks effect. The present results indicate that the nonreciprocity should be a new approach toward the superconductors with chiral or noncentrosymmetric structures.