The versatility of quantum dots---from single electrons to Andreev bound states

She will present research on quantum transport in various two-dimensional semiconductor and superconductor-semiconductor hybrid systems. As a common theme, she will focus on results on quantum dots. Firstly, formed in the well-established GaAs-based two-dimensional electron gas, they enable the study of physics at the level of single, isolated electrons.

She will showcase a general method to measure degeneracies and entropy from tunneling rates and argue how these results are relevant for state-of-the art research. From there, she will move on to valence band states in Ge/SiGe heterostructures, a material system that has attracted increasing attention in the past three years. She will discuss how the inherent spin-orbit interaction affects the quantum dot states and present results on Ge proximitized with superconducting Al. This will lead over to the third topic, which tackles Andreev bound states in proximitized InAs nanowires. The clean system clearly reveals so-far unrecognized signatures at the singlet-doublet quantum phase transition of Andreev bound states.