Ahmad, Halima Giovanna (2021) Physics of the Josephson effect in junctions with ferromagnetic barriers towards quantum circuits and RF applications. [Tesi di dottorato]

Anteprima

Testo Ahmad_Halima_Giovanna_33.pdf Download (57MB) | Anteprima

Abstract

Since its first discovering, several key superconducting applications directly use the Josephson effect. The improvement in material science and nanotechnologies allowed to build novel types of hybrid Josephson junctions. A traditional research path first aims at a complete understanding of the processes occurring in hybrid and unconventional Josephson devices, to be integrated in a second stage into real applications, and hopefully in frontier quantum circuits. In my work, I have addressed some key aspects of the physics in Josephson junctions with ferromagnetic barriers (SFS JJs), which fully falls in this category of unconventional junctions. In particular, I discuss the possibility to identify novel self-consistent and complementary protocols for the study of the fundamental physics in a special class of SFS JJs: the tunnel-SFS JJs, which use insulating ferromagnetic or multi-layered insulator-ferromagnet barriers. A special focus is given on the study of the dissipation mechanisms and the unconventional spin-triplet pairing that arises in these novel devices. I here show that the coexistence between tunnel conduction mechanisms and the ferromagnetic ordering in the barrier can be also exploited in quantum coherent devices, such as qubits.

Downloads

Actions (login required)

Modifica documento