1. Competitive exciton and polariton scattering inhibits condensation in two-dimensional metal-halide-semiconductor microcavities
- Author
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Quirós-Cordero, Victoria, Rojas-Gatjens, Esteban, Gómez-Dominguez, Martín, Li, Hao, Perini, Carlo A. R., Stingelin, Natalie, Correa-Baena, Juan-Pablo, Bittner, Eric R., Kandada, Ajay Ram Srimath, and Silva-Acuña, Carlos
- Subjects
Condensed Matter - Materials Science ,Physics - Chemical Physics - Abstract
Polariton condensation relies on the macroscopic occupation of the lowest-energy polariton state beyond a critical density. The mechanisms driving the occupation and depopulation of this state all rely on multi-particle scattering, whose dynamics determine the extent to which condensates can form spontaneously. To pinpoint many-body processes hindering polariton condensation in two-dimensional metal-halide semiconductors, we examine the exciton-polariton dynamics in a Fabry-P\'erot microcavity over timescales involving polariton ($\bm{\ll 1}$\,ps) and exciton scattering ($\bm{\gg 1}$\,ps). We find enhanced nonlinear exciton-exciton interactions in the microcavity versus the bare semiconductor and ultrafast polariton scattering depopulating the lowest-energy polariton state. We posit that the complex scattering landscape between the exciton reservoir and polaritons limits the formation of polariton condensates in these semiconductors, and we discuss the generality of our conclusions for highly polar materials in which the lattice mediates multi-particle correlations., Comment: 27 pages, 6 figures, plus supplementary material document. Submitted for publication
- Published
- 2024