Polaritons

Definition

Polaritons are hybrid particles made up of a photon strongly coupled to an electric dipole. Examples of such a dipole include an electron–hole pair in a semiconductor, which forms an exciton polariton, and the oscillating electrons at the surface of a metal, which creates a surface-plasmon polariton.

Featured

Latest Research and Reviews

News and Comment

  • News and Views |

    Spin–valley coupling in transition metal dichalcogenides has been shown to persist at room temperature when excitons are coherently coupled to cavity photons.

    • Gabriele Grosso
    Nature Photonics 11, 455–456
  • News and Views |

    Flow without friction is a strange phenomenon usually seen in quantum fluids that are cooled to temperatures near absolute zero, but features of superfluidity have now been seen with polaritons at ambient conditions.

    • Thilo Stöferle
  • Comments and Opinion |

    Although exciton–polariton lasers have been experimentally demonstrated in a variety of material systems, robust practical implementations are still challenging. Similarities with atomic Bose–Einstein condensates make the system suitable for chip-based quantum simulators for non-trivial many-body physics.

    • Michael D. Fraser
    • , Sven Höfling
    •  & Yoshihisa Yamamoto
    Nature Materials 15, 1049–1052
  • Editorial |

    Commercialization of exciton–polariton research as well as investigation of exciting physical phenomena in exciton–polariton condensates relies on improving material properties.