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HL: Fachverband Halbleiterphysik

HL 35: Focus Session: Transient multi-wave mixing on excitonic resonances

HL 35.6: Hauptvortrag

Donnerstag, 30. März 2023, 12:00–12:30, POT 251

Ultrafast dynamics and wave mixing at excitonic resonances in atomically thin semiconductors — •Andreas Knorr, Dominik Christiansen, Florian Katsch, Manuel Katzer, and Malte Selig — Technische Universität Berlin

Atomically thin semiconductors constitute an ideal playground for exciton physics in two dimensions. This involves optically accessible (bright) as well as spin- or momentum-forbidden (dark) excitonic states including intravalley and intervalley excitations. The nonlinear, coherent exciton and wave mixing dynamics induced by short light pulses result from the interplay of strong intrinsic exciton-exciton and exciton-phonon interactions and can be described in a many body Heisenberg equation of motion formalism. Here, we present applications of the theory to:

-exciton-exciton scattering and biexcitons in wave mixing,

-exciton wave function dynamics in time resolved ARPES,

-control of nonlinear excitonic Rabi-oscillations, and

-limits of the boson description of excitons.