MINATEC

The possibility to reverse the sign of the current-current cross-correlation in multiterminal nanostructures has attracted both theoretical and experimental interest in the last decade. Indeed, while the cross-correlation is always negative in non-interacting fermionic devices, a positive cross-correlation is the signature of strong interactions in many-body systems.

The possibility to reverse the sign of the current-current cross-correlation in multiterminal nanostructures has attracted both theoretical and experimental interest in the last decade. Indeed, while the cross-correlation is always negative in non-interacting fermionic devices, a positive cross-correlation is the signature of strong interactions in many-body systems. Moreover, a strong effort in quantum nanoelectronics is now directed towards the generation of Einstein-Podolsky-Rosen pairs of electrons, and the cross-correlation would be a useful tool to detect their entanglement. The goal of the PhD work will be to characterize in details the elementary processes of charge transfer in quantum mechanically coherent hybrid devices with several superconducting terminals, when electrons are transferred by Multiple Andreev Reflexions. The focus will be on the interplay between the AC Josephson and dissipative quasiparticle currents, on the spin resolved correlation and their relation with spin entanglement, as well as on the large sample-to-sample fluctuations of the current that could possibly arise in these structures.