Enhanced superconductivity in atomically thin TaS2.
Enhanced superconductivity in atomically thin TaS2.
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DOI：
10.1038/ncomms11043
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发表时间：
2016-03-17
影响因子：
16.6
通讯作者：
Coronado E
中科院分区：
文献类型：
--
作者：
Navarro-Moratalla E;Island JO;Mañas-Valero S;Pinilla-Cienfuegos E;Castellanos-Gomez A;Quereda J;Rubio-Bollinger G;Chirolli L;Silva-Guillén JA;Agraït N;Steele GA;Guinea F;van der Zant HS;Coronado E
将层状材料剥离到单层极限的能力为理解维度的逐渐减少如何影响散装材料的性质提供了机会。在这里，我们使用这种自上而下的方法来解决二维极限中的超导问题。研究了不同厚度的2 H二硫化钽薄片电子器件的输运特性。我们观察到，超导性持续到最薄的层调查（3.5 nm），有趣的是，我们发现一个显着的增强的临界温度从0.5到2.2 K的层变薄。此外，我们提出了一个紧束缚模型，这使我们能够将这种现象归因于有效的电子-声子耦合常数的增强。这项工作提供了证据，证明降低维度可以增强超导性，而不是迄今为止在其他2D材料中报道的弱化效应。 随着材料的厚度向原子尺度减小，尺寸限制可能会促进块体中未发现的行为，具有潜在的技术应用。在这里，作者研究了TaS 2的超导性，因为它是机械剥离向二维极限。
The ability to exfoliate layered materials down to the single layer limit has presented the opportunity to understand how a gradual reduction in dimensionality affects the properties of bulk materials. Here we use this top–down approach to address the problem of superconductivity in the two-dimensional limit. The transport properties of electronic devices based on 2H tantalum disulfide flakes of different thicknesses are presented. We observe that superconductivity persists down to the thinnest layer investigated (3.5 nm), and interestingly, we find a pronounced enhancement in the critical temperature from 0.5 to 2.2 K as the layers are thinned down. In addition, we propose a tight-binding model, which allows us to attribute this phenomenon to an enhancement of the effective electron–phonon coupling constant. This work provides evidence that reducing the dimensionality can strengthen superconductivity as opposed to the weakening effect that has been reported in other 2D materials so far. As a material's thickness decreases towards the atomic-scale, dimensional confinement may promote behaviour not found in the bulk, with potential technological applications. Here, the authors study superconductivity in TaS2 as it is mechanically exfoliated towards the two-dimensional limit.
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影响因子：
3.3
作者：
Guillamon, I.;Suderow, H.;Coronado, E.
通讯作者：
Coronado, E.
影响因子：
38.3
作者：
Dean, C. R.;Young, A. F.;Hone, J.
通讯作者：
Hone, J.
影响因子：
2
作者：
GAROCHE, P;MANUEL, P;MOLINIE, P
通讯作者：
MOLINIE, P
影响因子：
3.5
作者：
Goldman, AM;Markovic, N
通讯作者：
Markovic, N
影响因子：
19.6
作者：
Hermele, M;Refael, G;Goldbart, PM
通讯作者：
Goldbart, PM