  Ongoing advances in superconductors continue to revolutionize technology
thanks to the increasingly versatile and robust availability of lossless
supercurrent. In particular high supercurrent density can lead to more
efficient and compact power transmission lines, high-field magnets, as well as
high-performance nanoscale radiation detectors and superconducting spintronics.
Here, we report the discovery of an unprecedentedly high superconducting
critical current density (17 MA/cm2 at 0 T and 7 MA/cm2 at 8 T) in 1T'-WS2,
exceeding those of all reported two-dimensional superconductors to date.
1T'-WS2 features a strongly anisotropic (both in- and out-of-plane)
superconducting state that violates the Pauli paramagnetic limit signaling the
presence of unconventional superconductivity. Spectroscopic imaging of the
vortices further substantiates the anisotropic nature of the superconducting
state. More intriguingly, the normal state of 1T'-WS2 carries topological
properties. The band structure obtained via angle-resolved photoemission
spectroscopy and first-principles calculations points to a Z2 topological
invariant. The concomitance of topology and superconductivity in 1T'-WS2
establishes it as a topological superconductor candidate, which is promising
for the development of quantum computing technology.
