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Condensed Matter > Materials Science
Title: Ultrafast imaging of polariton propagation and interactions
(Submitted on 2 May 2022 (v1), last revised 15 Jun 2023 (this version, v2))
Abstract: Semiconductor excitations can hybridize with cavity photons to form exciton-polaritons (EPs) with remarkable properties, including light-like energy flow combined with matter-like interactions. To fully harness these properties, EPs must retain ballistic, coherent transport despite matter-mediated interactions with lattice phonons. Here we develop a nonlinear momentum-resolved optical approach that directly images EPs in real space on femtosecond scales in a range of polaritonic architectures. We focus our analysis on EP propagation in layered halide perovskite microcavities. We reveal that EP-phonon interactions lead to a large renormalization of EP velocities at high excitonic fractions at room temperature. Despite these strong EP-phonon interactions, ballistic transport is maintained for up to half-exciton EPs, in agreement with quantum simulations of dynamic disorder shielding through light-matter hybridization. Above 50% excitonic character, rapid decoherence leads to diffusive transport. Our work provides a general framework to precisely balance EP coherence, velocity, and nonlinear interactions.
Submission history
From: Milan Delor [view email][v1] Mon, 2 May 2022 19:36:12 GMT (5552kb)
[v2] Thu, 15 Jun 2023 20:23:30 GMT (4219kb)
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