Enhanced superconductivity in atomically thin TaS2

Abstract

The ability to exfoliate layered materials down to the single layer limit has opened 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 K 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 dimensionality can strengthen superconductivity as opposed to the weakening effect that has been reported in other 2D materials so far.

54 pages

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• Robust parity-mixed superconductivity in disordered monolayer transition metal dichalcogenides
• Voltage-Controllable Colossal Magnetocrystalline Anisotropy in Single Layer Transition Metal Dichalcogenides
• High-Throughput DFT-Based Discovery of Next Generation Two-Dimensional (2D) Superconductors
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• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
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• Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor
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• van der Waals heterostructures based on atomically-thin superconductors
• MSene: A new large family of two-dimensional transition metal sulfide with MXene structure
• Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance
• Endotaxial Stabilization of 2D Charge Density Waves with Long-range Order
• Mapping multi-valley Lifshitz transitions induced by field-effect doping in strained MoS2 nanolayers
• Examining the surface phase diagram of IrTe${}_2$ with photoemission
• Engineering nodal topological phases in Ising superconductors by magnetic superstructures
• Superconducting dome by tuning through a Van Hove singularity in a two-dimensional metal
• Unusual evolution of B_{c2} and T_c with inclined fields in restacked TaS_2 nanosheets
• Robust Gapless Superconductivity in 4Hb-TaS${}_2$
• Classifying induced superconductivity in atomically thin Dirac-cone materials
• Raman spectroscopy of few-layers TaS${}_2$ and Mo-doped TaS${}_2$ with enhanced superconductivity
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• Topological Ising pairing states in monolayer and trilayer TaS${}_2$
• Superconducting Contact and Quantum Interference Between Two-Dimensional van der Waals and Three-Dimensional Conventional Superconductors
• Quantifying the charge carrier interaction in metallic twisted graphene superlattices
• Constrained weak-coupling superconductivity in multiband superconductors
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• Manipulating Magnetic Moments by Superconducting Currents
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