论文标题
nbs $ _ {2} $ van der waals交界处的约瑟夫森效应
Josephson Effect in NbS$_{2}$ van der Waals Junctions
论文作者
论文摘要
范德华（VDW）约瑟夫森连接可能会加速高级超导装置的开发，该设备利用了二维（2D）过渡金属二甲藻元化（TMD）超导体的独特性能，例如旋转轨道耦合，Spin-Valley锁定。在这里，我们使用修改后的全干转移技术制造垂直堆叠的NBS $ _ {2} $/nbs $ _ {2} $ JOSEPHSON交界处，并通过系统的低温传输测量来表征设备性能。实验结果表明，NBS $ _ {2} $/NBS $ _ {2} $ JOSEPHSON JUNCTION的超导过渡温度为5.84 K，临界电流密度达到3975 A/cm $^{2} $ 2K。此外，我们提取了超导能量差距$δ= 0.58 $ MEV，它比单个频段S-Wave Bardeen-Cooper-Schrieffer（BCS）型号（$δ= 0.89 $ MEV）所期望的要小得多。
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$_{2}$/NbS$_{2}$ 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$_{2}$/NbS$_{2}$ Josephson junction is 5.84 K, and the critical current density reaches 3975 A/cm$^{2}$ at 2K. Moreover, we extract a superconducting energy gap $Δ=0.58$ meV, which is considerably smaller than that expected from the single band s-wave Bardeen-Cooper-Schrieffer (BCS) model ($Δ=0.89$ meV).
