Enhanced superconductivity in atomically thin TaS[subscript 2]
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Navarro-Moratalla-2016-Enhanced superconductivity.pdf
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Author(s)
Navarro-Moratalla, Efren Adolfo
Island, Joshua O.
Mañas-Valero, Samuel
Pinilla-Cienfuegos, Elena
Castellanos-Gomez, Andres
Quereda, Jorge
Rubio-Bollinger, Gabino
Chirolli, Luca
Silva-Guillén, Jose Angel
Agraït, Nicolás
Date Issued
March 2016
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Navarro-Moratalla, Efrén, Joshua O. Island, Samuel Mañas-Valero, Elena Pinilla-Cienfuegos, Andres Castellanos-Gomez, Jorge Quereda, Gabino Rubio-Bollinger, et al. “Enhanced Superconductivity in Atomically Thin TaS[subscript 2].” Nat Comms 7 (March 17, 2016): 11043.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/ncomms11043
