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Singly quantized vortices have been already observed in many systemsincluding the superfluid helium, Bose Einstein condensates of dilute atomicgases, and condensates of exciton polaritons in the solid state. Twodimensional superfluids carrying spin are expected to demonstrate a differenttype of elementary excitations referred to as half quantum vorticescharacterized by a pi rotation of the phase and a pi rotation of thepolarization vector when circumventing the vortex core. We detect half quantumvortices in an exciton-polariton condensate by means of polarization resolvedinterferometry, real space spectroscopy and phase imaging. Half quantumvortices coexist with single quantum vortices in our sample.

Observation of Half Quantum Vortices in an Exciton-Polariton Condensate