Dr Malcom Connolly

Nanostructured low-dimensional materials are an exciting sandpit for exploring fundamental ideas in condensed matter physics and could potentially enable next-generation quantum devices.

Superconducting quantum circuits integrated with mesoscopic semiconductor Josephson junctions have recently emerged as a particularly versatile platform for realising transmon qubits with gate-tuneable properties, and for studying interactions between quasiparticles and microwave light. In this talk I summarise progress towards realising these experiments with V-VI topological insulators and III-V 2D electron gases [1,2]. I will outline the main challenges with using these materials to realise topological phases in the presence of disorder and strong global magnetic fields, and describe some possible routes forward using magnetic materials [3].

[1] T. Schmitt, et al., Nano Lett. 22(7), 2595 (2022)

[2] V. Chidambaram, et al., Phys. Rev. Research 4, 023170 (2022)

[3] D. Burke, et al., arXiv:2302.10982 (2023)