A new study linked as a result to the TIMES project presents an exact solution for exciton dynamics in a two-band semiconductor model, capturing the transition from coherent to incoherent regimes. By incorporating light–matter, electron–electron, and electron–phonon interactions, the model reveals how excitonic polarization and coherence evolve under nonresonant below-gap excitation.
Using time-resolved angle-resolved photoemission spectroscopy (TR-ARPES), researchers observed distinct excitonic replicas and quantum beats that persist even in the incoherent regime. These long-lived coherences—resistant to phonon dephasing—suggest a new class of excitonic behavior, offering fresh insights into ultrafast dynamics and quantum material responses.
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