Towards 2D superconducting spintronics

Principal investigators

  1. Angelo Di Bernardo, University of Salerno & Universität Konstanz [webpage]
  2. Elke Scheer, Universität Konstanz [webpage]
  3. Hadar Steinberg, The Hebrew University of Jerusalem [webpage]
  4. Wolfgang Belzig, Universität Konstanz [webpage]

teaser picture

Abstract

The interaction between a conventional three-dimensional superconductor and a ferromagnet can transform conventional spin-singlet Cooper pairs into parallel-spin states, thus enabling superconducting spintronics based on spin-triplet supercurrents. The recent emergence of layered van der Waals heterostructures has opened new avenues for investigating superconductor/ferromagnet systems in two dimensions. Our research aims at two-dimensional superconductor/ferromagnet systems, focusing on discovering unconventional superconducting states and developing superconducting spintronic devices with innovative functionalities. Based on our previous work on bilayer systems of 2D superconductors and the helical vdW metal Cr1/3NbSe on this experience we will now study Josephson junctions and spin valve structures using also other helical F metals and/or semiconducting Fs in combination with NbSe2 and NbS2 as superconductors.

Our methodology encompasses material characterization, theoretical modeling, and experimental exploration of spectroscopic properties, culminating in device creation. Utilizing mechanical exfoliation and dry transfer under inert conditions, we develop 2DF/2DS systems and perform low-temperature spectroscopy through tunneling devices and scanning tunnelling microscopy. Theoretically we use Bogolubov-de Gennes and quasiclassical Green’s function methods, aiming to pinpoint optimal 2DS/2DF combinations for device usage, elucidate electronic spectra and transport phenomena.