Work package 1 – 2D materials technology

Here we target the development of technology for two-dimensional (2d) van der Waals bonded superconductors. These materials can be made ultra-thin (few monolayers), which makes them a promising platform for the investigation of quantum phase slip phenomena. The work in Zurich will focus on magic-angle bi-layer graphene, which was recently found to host superconductivity in bi-layers with a very certain ‘magic’ twist-angle. The unusual and probably strongly correlated superconducting phase is highly tunable with gate voltage. The tunability allows for a fine tuning of the phase slip rate, an essential parameter for the envisioned application in metrology that form the core of the project.

 

 

The work in Regensburg will center around the more established 2d superconductor NbSe₂. Using nanolithography, we will produce controlled nano-constrictions and nanowires in this material and push the quantum phase slip in this material towards the quantum coherent regime. In a second step the devices will be embedded into a cryogenic CMOS-environment, in order to operate the devices under well controlled conditions (together with work package 3). Finally, we will prepare arrays of phase-slip junctions and study collective and synchronization effects.