Relazione su invito
New insights into quantum spin Hall-based Josephson junctions.
Traverso Ziani N.
Josephson junctions based on the Quantum Spin Hall Effect (QSHE) offer a promising playground to manipulate the helical edge states in view of spintronics and superconducting spintronics applications. Despite an intense research effort, a theoretical model for some experimentally relevant setups was still missing. In this context, I will consider a QSH-based Josephson junction with a constriction between the edge channels. In this system, the transport of Cooper pairs is significantly affected by single-particle effects, and peculiar signatures emerge. In particular, I will show that the relevant flux quantum in the interference pattern doubles, and an anomalous Josephson effect arises in the presence of reconstructed edges. Lastly, I will describe how the Cooper pair injection and the interference oscillations are modified if the edge states are broadly extended across the junction.