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Two-dimensional (2D) transition metal dichalcogenides (TMDs) have a range ofunique physics properties and could be used in the development of electronics,photonics, spintronics and quantum computing devices. The mechanicalexfoliation technique of micro-size TMD flakes has attracted particularinterest due to its simplicity and cost effectiveness. However, for mostapplications, large area and high quality films are preferred. Furthermore,when the thickness of crystalline films is down to the 2D limit (monolayer),exotic properties can be expected due to the quantum confinement and symmetrybreaking. In this paper, we have successfully prepared macro-size atomicallyflat monolayer NbSe2 films on bilayer graphene terminated surface of6H-SiC(0001) substrates by molecular beam epitaxy (MBE) method. The filmsexhibit an onset superconducting critical transition temperature above 6 K, 2times higher than that of mechanical exfoliated NbSe2 flakes. Simultaneously,the transport measurements at high magnetic fields reveal that the parallelcharacteristic field Bc// is at least 4.5 times higher than the paramagneticlimiting field, consistent with Zeeman-protected Ising superconductivitymechanism. Besides, by ultralow temperature electrical transport measurements,the monolayer NbSe2 film shows the signature of quantum Griffiths singularitywhen approaching the zero-temperature quantum critical point.

Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2