Polariton Laser in the Bardeen-Cooper-Schrieffer Regime

Jiaqi Hu, Zhaorong Wang, Seonghoon Kim, Hui Deng, Sebastian Brodbeck, Christian Schneider, Sven Höfling, Nai H. Kwong, Rolf Binder

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Microcavity exciton polariton systems can have a wide range of macroscopic quantum effects that may be turned into better photonic technologies. Polariton Bose-Einstein condensation and photon lasing have been widely accepted in the limits of low and high carrier densities, but identification of the expected Bardeen-Cooper-Schrieffer (BCS) state at intermediate densities remains elusive, as the optical-gain mechanism cannot be directly inferred from existing experiments. Here, using a microcavity with strong polarization selectivity, we gain direct experimental access to the reservoir absorption in the presence of polariton condensation and lasing, which reveals a fermionic gain mechanism underlying the polariton laser. A microscopic many-particle theory shows that this polariton lasing state is consistent with an open-dissipative-pumped system analog of a polaritonic BCS state.

Original languageEnglish (US)
Article number011018
JournalPhysical Review X
Issue number1
StatePublished - Jan 28 2021

ASJC Scopus subject areas

  • General Physics and Astronomy


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