M. Sc. Karl Schiller, AG Cinchetti
What is my project about?
Angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique that allows investigating the electronic band structure of crystalline solids, providing insight into the electronic and magnetic properties of complex systems. In my project, we will use time-resolved (TR) ARPES to study the coupling between plasmonic excitations in optical metasurfaces and intersubband transitions in quantum well semiconductor heterostructures. In order to access the materials band structure in the whole Brillouin zone, a femtosecond extreme ultraviolet light source must be implemented in the TR-ARPES setup. This light source is realized by generating high harmonics of pulsed infrared photons in a noble gas jet.
What is my task in this project and what is my motivation?
My specific task is to develop the femtosecond extreme ultra-violet light source and to couple it to an ARPES system. I find the simultaneous access to the electron momentum and kinetic energy with a temporal resolution via TR-ARPES a fascinating measurement scheme, which provides application in various fields. The study of 2D electronic systems with such an experimental scheme is a novel approach to characterize numerous phenomena, such as the coupling between excitons and plasmons in hybrid structures.