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DOE OSTI · 1850802

Quantum interference between the optical Stark effect and resonant harmonic generation in WS 2

Morrow, Darien J.·Kohler, Daniel D.·Zhao, Yuzhou·Scheeler, Jason M.·Jin, Song·Wright, John C.
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Abstract

An applied field can modulate optical signals by resonance shifting via the Stark effect. The optical Stark effect uses ultrafast light in the transparency region of a material to shift resonances with speeds limited by the pulse duration or system coherence. In this Rapid Communication, we investigate the optical Stark effect in resonant optical harmonic generation using the A exciton transition of WS 2 . Multidimensional pump-harmonic-probe measurements, in which the probe is second- or third-harmonic emission, reveal not only large Stark shifts that are commensurate with the large optical susceptibilities common to WS 2 excitons, but also behaviors more complex than simple optical Stark effect treatments predict. We show how another manifestation of the Stark effect, brought forth by coherent photon exchange between the pump and harmonic generation fundamental fields, can strongly enhance or suppress harmonic generation.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYCoherent controlExcitonsMaterials ScienceNonlinear opticsPerturbative methodsPhysicsSemiclassical methodsStark effectTransition metal dichalcogenidesUltrafast phenomena

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Morrow, Darien J., Kohler, Daniel D., Zhao, Yuzhou, Scheeler, Jason M., Jin, Song, Wright, John C.. 2020-10-02. Quantum interference between the optical Stark effect and resonant harmonic generation in WS 2. https://doi.org/10.1103/physrevb.102.161401

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