You’ll find a list of topics offered by the supervisors of the various groups here.
Please note that this is just a selection of topics that gives you an idea what a topic could look like. Most theses topics however are set on an individual basis with a supervisor. In order to find a suitable topic for your interest, reflect on the lectures you had, the supervisors you got to know, the research projects currently carried out in the department. Once you have an idea, please feel free to contact a potential supervisor for an open discussion.