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  • Title: Observation of half-quantum vortices in an exciton-polariton condensate.
    Author: Lagoudakis KG, Ostatnický T, Kavokin AV, Rubo YG, André R, Deveaud-Plédran B.
    Journal: Science; 2009 Nov 13; 326(5955):974-6. PubMed ID: 19965506.
    Abstract:
    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 pi rotation of the phase and a pi 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.
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