2025/11/04 by Arnab Ghosh, Ghosh, Arnab, Patrick Brosseau +7 · 1 voice
Engineering · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Perovskite Materials and Applications #Quantum Physics (quant-ph) #Spectroscopy and Quantum Chemical Studies #Strong Light-Matter Interactions #cond-mat.mtrl-sci #quant-ph
paper · pdf · doi:10.48550/arxiv.2511.02678
openalex publication_date 2025/11/04 · arxiv published 2025/11/04 · arxiv updated 2025/11/04 · openalex created_date 2025/11/06 · openalex updated_date 2026/07/28
Superfluorescence, the cooperative burst of spontaneous emission from an ensemble of dipoles, arises when microscopic oscillators spontaneously synchronize their phases. Here we show that this process can be reversed in time within quantum materials. Coherent multidimensional spectroscopy of halide perovskite quantum dots reveals a delayed cooperative absorption burst, the mirror image of superfluorescent emission, driven by transient polaron fields that phase-lock unit-cell dipoles within 100 fs. The effect scales systematically with quantum-dot size and halide composition, reaching near-unity coherence fidelity even at 300 K. A microscopic exciton-polaron model reproduces the buildup and decay of the coherent state, identifying lattice polarons as the mediators of synchronization. These results demonstrate that many-body temporal coherence can self-organize and persist at room temperature, opening routes toward engineered collective optical states and superabsorbing quantum devices.