Breaking of Particle-Hole Symmetry by Landau Level Mixing in the v=5/2 Quantized Hall State

We perform numerical studies to determine if the fractional quantum Hall state observed at a filling factor of v = 5/2 is the Moore-Read wave function or its particle-hole conjugate, the so-called anti-Pfaffian. Using a truncated Hilbert space approach we find that, for realistic interactions, including Landau-level mixing, the ground state remains fully polarized and the anti-Pfaffian is strongly favored.