Exciton-coherence generation through diabatic and adiabatic dynamics of Floquet state

Abstract

Floquet engineering of electronic systems is a promising way of controlling quantum material properties on an ultrafast time scale. So far, the energy structure of Floquet states in solids has been observed through time and angle-resolved photoelectron spectroscopy or pump-probe measurement techniques. However, the dynamical aspects of the photon-dressed states under ultrashort pulse driving have not been explored yet. Their dynamics become highly sensitive to the envelope of the driving field when the light-matter interaction enters non-perturbative regime, and thus, understanding of them is crucial for ultrafast manipulation of quantum state. Here, we observed coherent exciton emissions under intense and non-resonant mid-infrared fields in monolayer WSe2 at room temperature, which is unexpected in perturbative nonlinear optics. Together with numerical calculations, our measurements revealed that the coherent exciton emission reflects the diabatic and adiabatic dynamics of Floquet states. Our results provide a new approach to probing the dynamics of the Floquet state and lead to control of quantum materials through pulse shaping of the driving field.

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Cited by in corpus (6)

• Effects of Floquet Engineering on the Coherent Exciton Dynamics in Monolayer WS${}_2$
• Electron-spin double resonance of nitrogen-vacancy centers in diamond under strong driving field
• Floquet Analysis of Frequency Collisions
• Light-field dressing of transient photo-excited states above $E_F$
• Spirals, vortices, and helicity entanglements in dynamical Sauter-Schwinger pair creation
• Topical review on acousto-optical Floquet engineering of single-photon emitters