Exciton Coherence in 2D Materials

Basic data for this project

Description

In this project, the coherent properties of indirect excitons shall be experimentally explored in so-called 2D materials. The material class shall comprise atomically thin monolayers of transition metal-dichalcogenides and particularly their heterostructures. An important emphasis will be put on the temporal and spatial coherence as well as on the potential condensation of the indirect excitons as a function of particle-, spin- and valley-quantum numbers and temperature. On the one hand, heterostructures of varying monolayer materials shall be investigated to examine the exciton coherence as a function of exciton binding energy, interfacial quality, and the specific crystallographic alignment of the monolayers. On the other hand, state-of-the-art lithography methods will be applied to ultra-clean samples in order to realize nanoscale excitonic traps and circuits. On top of a material and size variation of the traps, field effect structures will be built such that the excitonic states can be individually addressed and optoelectronically analyzed. In particular, the dynamics of the trap-filling and the storage of the indirect excitons shall be examined as a function of the energy and polarization of the exciting laser, the trap potential, the exciton density, the temperature and a magnetic field. The project aims at exploring new materials and concepts for integrating atomically thin 2D materials into future optoelectronic circuits and detectors.