期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/ncomms11043
关键词
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资金
- EU (ELFOS project)
- EU (ERC Advanced Grant SPINMOL)
- Spanish MINECO (Excellence Unit Maria de Maeztu') [MDM-2015-0538]
- Spanish MINECO (Project Consolider-Ingenio in Molecular Nanoscience)
- Spanish MINECO (FEDER) [MAT2011-25046, MAT2014-57915-R]
- Dutch organization for Fundamental Research on Matter (FOM)
- NWO/OCW
- Comunidad Autonoma de Madrid [MAD2D-CM -S2013/MIT-3007-, NANOFRONTMAG-CM -S2013/MIT-2850]
- Generalitat Valenciana (Prometeo Program)
- BBVA Foundation through the fellowship 'I Convocatoria de Ayudas Fundacion BBVA a Investigadores, Innovadores y Creadores Culturales' ('Semiconductores ultradelgados: hacia la optoelectronica flexible')
- MINECO (Ramon y Cajal program) [RYC-2014-01406]
- MICINN [MAT2014-58399-JIN]
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.
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