Josephson Effect in NbS van der Waals Junctions
arXiv:2211.01609 · doi:10.1021/acs.jpclett.2c02927
Abstract
Van der Waals (vdW) Josephson junctions can possibly accelerate the development of advanced superconducting device that utilizes the unique properties of two-dimensional (2D) transition metal dichalcogenide (TMD) superconductors such as spin-orbit coupling, spin-valley locking. Here, we fabricate vertically stacked NbS/NbS Josephson junctions using a modified all-dry transfer technique and characterize the device performance via systematic low-temperature transport measurements. The experimental results show that the superconducting transition temperature of the NbS/NbS Josephson junction is 5.84 K, and the critical current density reaches 3975 A/cm at 2K. Moreover, we extract a superconducting energy gap meV, which is considerably smaller than that expected from the single band s-wave Bardeen-Cooper-Schrieffer (BCS) model ( meV).
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