We implement multidimensional coherent spectroscopy to study the coherent dynamics of excitons and exciton polaritons in high quality GaAs microcavity by controlling experimental parameters such as excitation density and detuning. In the intensity dependence measurements, above a certain threshold density, the diagonal peak broadens and shifts to higher energy, and an additional cross-peak becomes evident. At these high excitation densities, non-linear interactions begin to dominate and lead to these effects.
About the presenter
Tatek Lemma is a PhD student working with CI Jeff Davis in FLEET’s Research Theme 3 and in Research theme 2. For his PhD, he is working on the investigation of topological phase transition in a 2D semiconductor using the state-of-the-art Coherent multidimensional spectroscopy.