Observation of half-quantum vortices in an exciton-polariton condensate

K. G. Lagoudakis, T. Ostatnický, A. V. Kavokin, Y. G. Rubo, R. André, B. Deveaud-Plédran

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229 Citations (Scopus)


Singly quantized vortices have already been observed in many systems, including the superfluid helium, Bose-Einstein condensates of dilute atomic gases, and condensates of exciton-polaritons in the solid state. Two-dimensional superfluids carrying spin are expected to demonstrate a different type of elementary excitations referred to as half-quantum vortices, characterized by a π rotation of the phase and a π rotation of the polarization vector when circumventing the vortex core. We detect half-quantum vortices in an exciton-polariton condensate by means of polarization-resolved interferometry, real-space spectroscopy, and phase imaging. Half-quantum vortices coexist with single-quantum vortices in our sample.
Original languageEnglish
Pages (from-to)974 -976
Number of pages3
Issue number5955
Publication statusPublished - 13 Nov 2009


  • half-quantum vortices
  • exciton polariton condensates
  • polarization
  • spectroscopy

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