  The fractional quantum Hall state at Landau level (LL) filling factor 5/2 is
extremely interesting because it is likely the first non-Abelian state, but its
precise nature remains unclear after decades of study. We demonstrate this can
be resolved by studying the chirality of its graviton excitations, using
circularly polarized Raman scattering. We discuss the advantage of this bulk
probe over the existing edge probes.
