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Tracking the Photoinduced Dynamics of a Dark Excitonic State in Single-Layer WS_{2} via Resonant Autler-Townes
Angela Montanaro1,2,3, Francesco Valiera4,5, Francesca Giusti1,2
1Università degli Studi di Trieste, Department of Physics, Trieste, Italy.
Abstract:
Excitons in monolayer transition metal dichalcogenides (1L-TMDs) exhibit a Rydberg-like series of bound states, including optically dark levels. Using a three-pulse scheme, we directly track the dynamics of the 2p dark exciton in 1L-WS_{2} through the Autler-Townes splitting of the bright 1s state. The splitting, induced by a midinfrared field resonant with the 1s-2p transition, reveals distinct 1s and 2p responses to photoexcitation. This approach provides new insight into many-body effects and offers a versatile experimental framework to probe driven excitonic dynamics in quantum materials.
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