  Gate tunable two-dimensional (2D) superconductors offer significant
advantages when studying superconducting phase transitions. Here, we address
superconductivity in exfoliated 1T'-MoTe2 monolayers with an intrinsic band gap
of ~7.3 meV using electrostatic doping. Despite large differences in the
dispersion of the conduction and the valence bands, superconductivity can be
achieved easily for both electrons and holes. The onset of superconductivity
occurs near 7-8K for both charge carrier types. This temperature is much higher
than in bulk samples. Also the in-plane upper critical field is strongly
enhanced and exceeds the BCS Pauli limit in both cases. Gap information is
extracted using point-contact spectroscopy. The gap ratio exceeds multiple
times the value expected for BCS weak-coupling. All these observations suggest
a strong enhancement of the pairing interaction.
