Transition from 3-dimensional to 2-dimensional Ising superconductivity in few-layer NbSe₂ by proximity effect from van der Waals heterostacking

The coexistence of superconductivity and spin-orbit coupling in an Ising superconductor has garnered attention in recent times due to its prospect of having topologically non-trivial phases. In this work, we report the observation of Ising superconductivity in a bulk NbSe₂ stacked over a monolayer MoS₂ which in contrast to earlier reports has advantage in terms of yield, stability, and flexibility for complex device structure. Through systematic and comparative magnetotransport measurement we confirmed the existence of 2D Ising superconductivity in the heterostructure with 3D behavior of the pristine NbSe₂. The 2D nature of the superconductivity in the stack was further probed through resistance fluctuation spectroscopy establishing universal BKT type behavior. Moreover, we studied the vortex dynamics of the system in perpendicular magnetic field which shows the influence of monolayer MoS₂ in transport characteristics of the heterostructure.