Proximity-induced unconventional superconductivity

Supervisor: Prof. Dr. Stuart Parkin
Responsible Scientific Pillar Coordinator: Dr. Banabir Pal

Within this project, our goal is to explore the intricate connections among recent discoveries in superconductivity, magnetism, and topology. In particular, we are interested in various forms of Cooper pairing facilitated by the proximity interaction of a superconductor with the topological electronic and magnetic structures. The project comprises three key areas of research:

1. Generating spin-polarized triplet supercurrents in lateral/vertical Josephson junctions [1].

2. Investigation of the proximity-induced non-reciprocal transport in superconducting interfaces and Josephson junctions [2,3].

3. High-frequency experiments in superconductor/ferromagnet interfaces to understand the magnon-fluxon interaction [4].

We utilize advanced deposition setups and glove boxes to create new superconducting heterostructures. The next step involves fabrication of the Josephson junctions and other hybrid devices. Subsequently, we measure the low and high-frequency response of these devices at ultra-low temperatures.

The following instruments are available for working on the topic: Advanced thin-film deposition systems (Sputtering, MBE and PLD), Glove box, Optical and electrical Lithography, Focused ion beam, PPMS, Dilution fridge equipped with 3D vector magnet.

Prospective candidates should have a solid understanding of solid-state physics, especially in magnetism and superconductivity. Prior experience with the mentioned experimental systems is beneficial but not mandatory.

Literature:

[1] J. Linder et al., Nat. Phys. 11 (2015)

[2] B. Pal et. al., Nat. Phys. 18 (2022)

[3] K.-R. Jeon et al., Nat. Mater. 21 (2022)

[4] O. V. Dobrovolskiy et. al., Nat. Phys. 15 (2019)

Contact:

For scientific questions about the possible PhD topic, please contact Dr. Banabir Pal. For formal questions regarding the application, please contact Michael Strauch.