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ARTICLE SUMMARY / 2025

Exciton polariton condensation in a perovskite moiré flat band at room temperature

F. Jin, J. Ren, S. Zanotti … R. Su (13 authors)

Science Advances · 11, eadx2361

Summary

Can moiré flat bands support collective light–matter behaviour at room temperature?

Combines a perovskite excitonic medium with a moiré photonic landscape.

Reports exciton-polariton condensation in a flat band.

Commentary

The result belongs to this material and pumping regime; it is not evidence that all moiré cavities lase or condense similarly.

Moves band engineering from passive transport into driven, interacting hybrid states.

Interpretation and connections in this note, separate from the authors’ reported findings.

Related modelling approaches

Relation labels come from the method guide and are editorial. Unlabelled links are conceptual connections or comparison methods; the paper does not necessarily implement them.

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2024 / Numerical method

Legume: A free implementation of the guided-mode expansion method for photonic crystal slabs

S. Zanotti, M. Minkov, D. Nigro, D. Gerace, S. Fan & L. C. Andreani

Expands fields in guided modes and adds symmetry, radiation and excitonic coupling treatments.

Summary & commentary : Legume: A free implementation of the guided-mode expansion method for photonic crystal slabs