Visualization of Macroscopic Ising Superconducting State in Superconductor‐Graphene Junctions

Graphene-based two-dimensional van der Waals Josephson junctions with superconductors are hopeful for realizing versatile quantum devices. However, research on the Ising in atomic-layer transition metal dichalcogenides, whose superconductivity is resilient to strong in-plane magnetic fields, has remained elusive. Here scanning tunneling microscopy study of single-layer (SL) NbSe2 island and its long-range proximity effect adjacent graphene high spatial energy resolution reported. It found that SL manifests as an superconductor while area larger than about 800 nm2. Moreover, superconducting from generates a gap graphene, which can extend over several tens nanometers without obvious decay. Such makes intrinsically non-superconducting superconductor. More intriguingly, such survive under following behavior NbSe2. This work reveals brand-new macroscopic regime, opening perspectives superconductor-based devices outstanding functionality.