From 2d-van der Waals magnets to superconductor hybrid devices

Doctoral thesis, 2023

This thesis focuses on two distinct topics in different lines of research within mesoscopic physics. The first topic is related to magnons in 2d-van der Waals magnets. In extension to previous work, we discuss properties of the magnon disperson of a bilayer system and uncover an underlying PT-symmetry, which explains the topology of the magnon spectrum and the absence of a magnon Hall effect in our system. The second topic deals with a quantum dot device (NDS) consisting of a quantum dot proximized by a large gap superconductor and weakly coupled to a normal metal. We study the transient dynamics, including charge and heat transport after distinct switches in gate voltage, which prepare the initial state.
The analysis makes significantly use of a so called fermionic duality, a novel dissipative symmetry. This way we obtain a detailed microscopic understanding of how to control charge and heat currents in this NDS-nanostructure.