Perovskite exciton-polaritons

Nano Lett., 18, 3335−3343 (2018)

Microcavity exciton-polariton is a Bosonic quasi-particle of half-matter and half-light formed by strong coupling between semiconductor exciton and microcavity photon. With effective mass 10⁴ times lower than electrons, the exciton-polariton provide opportunities for realizing all-solid-state Bose-Einstein condensation (BEC) and superfluities at room temperature and generating a variety of novel excitonic and quantum devices, such as ultra-low threshold polariton lasing, entangling light sources and slowing light devices, etc. However, till now owing to the low intrinsic oscillation strength, the exciton-polaritons of inorganic semiconductor are mainly either operated under low temperature, or in ultra-violet regime. On the other hand, the exciton-polariton condensation of organic semiconductor is still challenging because of weak nonlinearity. These extensively hinder the development of exciton-polariton devices.

Qing Zhang and her co-workers demonstrated surface plasmon enhanced strong exciton-polariton effect in hybrid inorganic−organic perovskite nanowire Fabry-Pérot microcavities operated under room temperature. Their spectroscopic study shows that the local oscillation density is effectively redistributed and enhanced in semiconductor−insulator−metal (MIS, CH₃NH₃PbBr₃ nanowire−SiO₂−Ag) structure. The Rabi splitting energy reaches up to 564 meV at ~520 nm. The coupling strength is almost twice as much as reported in the other semiconductor nanowires of the same emission color. Their study shows that the perovskite would open new avenues to enrich the fundaments and applications of exciton-polaritons.

Jun Zhang (Institute of Semiconductors, CAS, Beijing, China)

doi: 10.1088/1674-4926/40/2/020201