6533b823fe1ef96bd127edda

RESEARCH PRODUCT

van der Waals heterostructures based on atomically-thin superconductors

Eugenio CoronadoCarla Boix‐constantSamuel Mañas‐valeroRosa Córdoba

subject

Phase transitionFabricationMaterials scienceField (physics)FOS: Physical sciencesInsulator (electricity)02 engineering and technology01 natural sciencesSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsCondensed Matter::Superconductivity0103 physical sciences010306 general physicsMaterialsSuperconductivityCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Condensed Matter - SuperconductivityConductivitat elèctrica021001 nanoscience & nanotechnologyElectronic Optical and Magnetic MaterialsCharacterization (materials science)Topological insulator0210 nano-technologyCharge density wave

description

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.

yearjournalcountryeditionlanguage
2021-02-27
https://dx.doi.org/10.48550/arxiv.2103.00203