Masters Defense: Bjarke Rasmus Nicolaisen – University of Copenhagen

Masters Defense: Bjarke Rasmus Nicolaisen

Properties of Proximitized 2DEGs

Abstract

My thesis investigates theoretically the proximity effect on a 2D electron gas (2DEG). In the first part of the thesis defense we will discuss properties of a 2DEG-superconductor junction with a Zeeman term from a wave-function perspective. We will then derive a correspondence between the wave-function model and a Green’s function model in the tunneling regime. In the second part we will study tunneling spectroscopy of proximitized 2DEGs including both a Zeeman term and, eventually, Rashba spin-orbit interaction. We will compare these results to experiments performed at the Center for Quantum Devices at NBI. We get a qualitative match with experiment only by allowing a Zeeman-energy that is too large compared to what is expected from similar experiments.