van der Waals heterostructures based on atomically-thin superconductors

Abstract

Van der Waals heterostructures (vdWHs) allow the assembly of high-crystalline two-dimensional (2D) materials in order to explore dimensionality effects in strongly correlated systems and the emergence of potential new physical scenarios. In this work, it is illustrated the feasibility to integrate 2D materials in-between 2D superconductors. Particularly, it is presented the fabrication and electrical characterization of vertical vdWHs based on air-unstable atomically-thin transition metal dichalcogenides formed by NbSe2/TaS2/NbSe2 stacks, with TaS2 being the insulator 1T-TaS2 or the metal 2H-TaS2. Phase transitions as 1T-TaS2 charge density wave and NbSe2 superconductivity are detected. An enhancement of the vdWH resistance due to Andreev reflections is observed below the superconducting transition temperature of the NbSe2 flakes. Moreover, in the NbSe2 superconducting state, the field and temperature dependence of the normalized conductance is analyzed within the Dynes' model and the overall behavior is consistent with the Bardeen-Cooper-Schrieffer theory. This vdWH approach can be extended to other 2D materials, such as 2D magnets or topological insulators, with the aim of exploring the new emergent properties that may arise from such combinations.

arXiv comment18 pages, 5 figures

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• Van der Waals heterostructures
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Cited by in corpus (13)

• Multistep magnetization switching in orthogonally twisted ferromagnetic monolayers
• Probing the spin dimensionality in single-layer CrSBr van der Waals heterostructures by magneto-transport measurements
• Chemical design and magnetic ordering in thin layers of 2D MOFs
• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
• Evidence of nodal superconductivity in monolayer 1H-TaS${}_2$ with hidden order fluctuations
• Programmable Magnetic Hysteresis in Orthogonally-Twisted Two-Dimensional CrSBr Magnets via Stacking Engineering
• Probing Short-Range Correlations in the van der Waals Magnet CrSBr by Small-Angle Neutron Scattering
• Enhanced Superconductivity and Electron Correlations in Intercalated ZrTe${}_3$
• Crystalline superconductor-semiconductor Josephson junctions for compact superconducting qubits
• One-Dimensional Materials Supported in Two-Dimensional van der Waals Metal-Organic Frameworks with Optical Anisotropy Switching via Twist-Engineering
• Quantum Phases and Spin Liquid Properties of 1T-TaS2
• Strain Switching in van der Waals Heterostructures triggered by a Spin-Crossover Metal Organic Framework
• Realization of Air-Stable Two-Dimensional Superconductor Nb2Pd3Te5 With Quasi-One-Dimensional Pair Density Modulation