Enhanced superconductivity in atomically thin TaS 2

Efrén Navarro-Moratalla, Joshua O. Island, Samuel Manãs-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, Eugenio Coronado

Research output: Contribution to journalArticleScientificpeer-review

174 Citations (Scopus)
52 Downloads (Pure)

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.

Original languageEnglish
Article number11043
Pages (from-to)1-7
Number of pages7
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 17 Mar 2016

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