Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 8: Ultra-fast Phenomena I
HL 8.1: Talk
Monday, March 9, 2026, 15:00–15:15, POT/0006
Lightwave Engineering of Excitonic States in an Atomically Thin Semiconductor — •Omer Kneller1, Niloufar Nilforoushan1, Matthias Knorr1, Markus Borsch2, Fabian Mooshammer1, Mackillo Kira2, and Rupert Huber1 — 1Department of Physics, University of Regensburg, 93040 Regensburg, Germany — 2Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA
Coherently shaping excitonic states holds great potential for novel optoelectronics and quantum information processing. Yet, their femtosecond-scale coherence time substantially constrains coherent control. Here, intense phase-stable carrier waves of light resonantly drive the excitonic 1s-2p states in monolayer MoSe2 faster than their natural decoherence rate, driving the excitonic system into multiple Rabi oscillations that occur during a single cycle of light. The dynamics are probed by injecting excitons into the 1s state using femtosecond NIR pulses and measuring the induced high-order sideband emission. The signal exhibits surprising spectro-temporal signatures that are reproduced by many-body simulations and a reduced two-level model, exposing the dominant role of the 1s-2p sub-system, even under these extreme driving conditions. An intuitive Floquet analysis links these features to light-induced avoided crossings between higher-order Floquet replicas of the driven two-level system. Our results bridge lightwave electronics in quantum materials, attosecond science, and atomic physics, and establish an exciting new route to shaping many-body quantum correlations at optical clock rates.
Keywords: Lightwave electronics; 2D materials; Subcycle dynamics; many-body correlations; Floquet band engineering