6533b7d7fe1ef96bd12690c3
RESEARCH PRODUCT
Enhanced superconductivity in atomically thin TaS2
Andres Castellanos-gomezAndres Castellanos-gomezFrancisco GuineaElena Pinilla-cienfuegosElena Pinilla-cienfuegosGary A. SteeleJorge QueredaNicolás AgraïtNicolás AgraïtJosé ÁNgel Silva-guillénEugenio CoronadoHerre S. J. Van Der ZantJoshua O. IslandEfrén Navarro-moratallaEfrén Navarro-moratallaSamuel Mañas‐valeroLuca ChirolliGabino Rubio-bollingersubject
SuperconductivityWork (thermodynamics)Materials scienceScienceTantalumFOS: Physical sciencesGeneral Physics and Astronomychemistry.chemical_element02 engineering and technology01 natural sciencesArticleGeneral Biochemistry Genetics and Molecular BiologySuperconductivity (cond-mat.supr-con)Mesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciences010306 general physicsSuperconductivitatSuperconductivityCoupling constantMultidisciplinaryCondensed Matter - Mesoscale and Nanoscale PhysicsAtomically thinCondensed matter physicsCondensed Matter - SuperconductivityQDisulfide bondFísicaGeneral ChemistryCiència dels materials021001 nanoscience & nanotechnologychemistry0210 nano-technologyLayer (electronics)Single layerCurse of dimensionalitydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-03-17 |