Researchers demonstrated a new form of Floquet engineering in which excitons, rather than intense light fields, act as the periodic drive.

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Researchers have demonstrated a breakthrough in Floquet engineering by using excitons instead of intense light fields to modify quantum materials. This approach couples more strongly to matter than photons, achieving clear Floquet effects at much lower light intensities while avoiding material damage. Using time- and angle-resolved photoemission spectroscopy, the team observed excitonic Floquet replicas that required significantly less energy than optical methods. This opens pathways to engineering novel material properties using other bosonic excitations like phonons, plasmons, and magnons, making practical Floquet engineering more feasible for creating quantum devices and materials.

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