论文标题
通过控制NBSE $ _2 $单层之间的控制金属/超导体到绝缘体/超导体耦合。
Tuning metal/superconductor to insulator/superconductor coupling via control of proximity enhancement between NbSe$_2$ monolayers
论文作者
论文摘要
电荷转移与电子疾病之间的相互作用在过渡金属二进制多元化多层中会导致超导耦合，这是由于邻近性增强，隧道和超导波动驱动的，但却笨拙。带有原子精度引入的人工间隔层通过电荷转移改变状态的密度。在这里，我们调整了NBSE $ _2 $单层之间的超导耦合。我们将[（snse）$ _ {1+δ} $] $ _ m $ [nbse $ _2 $] $ _ 1 $量身定制的具有不同snse层厚度的多层。从高场磁通转交款从临界场产生了金茨堡 - 兰道相干长度，跨平面增加了140％，M> 9的趋势趋向于二维超导性。我们显示了三个方案：金属之间的交叉：与近距离增强的伴侣搭配，无序无效，与j的相互互动和互联网的指标。我们的结果表明，堆叠金属的单核和二分法允许将金属/超导体转换为绝缘体/超导体系统，从而控制了嵌入式层中二维超导性的控制。
The interplay between charge transfer and electronic disorder in transition-metal dichalcogenide multilayers gives rise to superconductive coupling driven by proximity enhancement, tunneling and superconducting fluctuations, of a yet unwieldy variety. Artificial spacer layers introduced with atomic precision change the density of states by charge transfer. Here, we tune the superconductive coupling between NbSe$_2$ monolayers from proximity-enhanced to tunneling-dominated. We correlate normal and superconducting properties in [(SnSe)$_{1+δ}$]$_m$[NbSe$_2$]$_1$ tailored multilayers with varying SnSe layer thickness. From high-field magnetotransport the critical fields yield Ginzburg-Landau coherence lengths with an increase of 140 % cross-plane , trending towards two-dimensional superconductivity for m > 9. We show cross-over between three regimes: metallic with proximity-enhanced coupling, disordered-metallic with intermediate coupling and insulating with Josephson tunneling. Our results demonstrate that stacking metal mono- and dichalcogenides allows to convert a metal/superconductor into an insulator/superconductor system, prospecting the control of two-dimensional superconductivity in embedded layers.
