Nano-Optics of 2D Semiconductors
Electrons in two-dimensional layered semiconductors like MoS2 possess additional degrees of freedom compared to conventional semiconductors. Apart from charge and spin, they can be assigned valley (direction) and layer indexes. This opens up many opportunities for the observation of novel physical phenomena and constitutes a new resource for the design of optoelectronic devices.
The interplay between spin, valley and layer numbers in few-layer van der Waals semiconductors gives rise to very rich exciton Physics. Our group investigates the optical properties of these fascinating materials through a combination of low-temperature photoluminescence, optical polarization, magneto-photoluminescence, photocurrent and scanning-tunneling microscopy techniques.
A major focus of our research is the demonstration of novel nano-optical effects, where light-matter interaction is governed by specific spin and valley Physics. The overarching goal is a better understanding of optical chirality at the nanoscale: its physical origin, its enhancement and manipulation, and possible chiral nanophotonic devices.