2021/02/27 by Carla Boix-Constant, Carla Boix‐Constant, Samuel Mañas-Valero +3
Materials Science · Physics and Astronomy · #2D Materials and Applications #Charge density wave #Conductance #Curse of dimensionality #Graphene research and applications #Heterojunction #Metal–insulator transition #Phase transition #Proximity effect (electron beam lithography) #Superconductivity #Topological Materials and Phenomena #cond-mat.str-el #cond-mat.supr-con #van der Waals force
paper · pdf · doi:10.1002/aelm.202000987
published as Advanced Electronic Materials 7, 7, 2000987 (2021) · 18 pages, 5 figures
arxiv created 2021/02/27 · openalex created_date 2021/03/15 · openalex publication_date 2021/04/25 · arxiv updated 2021/07/13 · openalex updated_date 2026/08/06
Abstract Van der Waals heterostructures (vdWHs) allow the assembly of high‐crystalline 2D materials in order to explore dimensionality effects in strongly correlated systems and the emergence of potential new physical scenarios. In this work, the feasibility of integrating 2D materials in‐between 2D superconductors is illustrated. In particular, the fabrication and electrical characterization of vertical vdWHs based on air‐unstable atomically‐thin transition metal dichalcogenides formed by NbSe 2 /TaS 2 /NbSe 2 stacks, with TaS 2 being the insulator 1T‐TaS 2 or the metal 2H‐TaS 2 , is presented. Phase transitions as 1T‐TaS 2 charge density wave and NbSe 2 superconductivity are detected. An enhancement of the vdWH resistance due to Andreev reflections is observed below the superconducting transition temperature of the NbSe 2 flakes. Moreover, in the NbSe 2 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.