Enhanced superconductivity in atomically thin TaS2

Efrén Navarro-Moratalla (), Joshua O. Island (), Samuel Mañas-Valero, Elena Pinilla-Cienfuegos, Andres Castellanos-Gomez, Jorge Quereda, Gabino Rubio-Bollinger, Luca Chirolli, Jose Angel Silva-Guillén, Nicolás Agraït, Gary A. Steele, Francisco Guinea, Herre S. J. van der Zant and Eugenio Coronado ()
Additional contact information
Efrén Navarro-Moratalla: Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2
Joshua O. Island: Kavli Institute of Nanoscience, Delft University of Technology
Samuel Mañas-Valero: Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2
Elena Pinilla-Cienfuegos: Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2
Andres Castellanos-Gomez: Kavli Institute of Nanoscience, Delft University of Technology
Jorge Quereda: Universidad Autónoma de Madrid, Campus de Cantoblanco
Gabino Rubio-Bollinger: Universidad Autónoma de Madrid, Campus de Cantoblanco
Luca Chirolli: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia)
Jose Angel Silva-Guillén: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia)
Nicolás Agraït: Universidad Autónoma de Madrid, Campus de Cantoblanco
Gary A. Steele: Kavli Institute of Nanoscience, Delft University of Technology
Francisco Guinea: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia)
Herre S. J. van der Zant: Kavli Institute of Nanoscience, Delft University of Technology
Eugenio Coronado: Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms11043

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