Hall conductivity near the z=2 Superconductor-Insulator transition in two dimensions -: art. no. 073308

We analyze here the behavior of the Hall conductivity sigma(xy) near a z=2 insulator-superconductor quantum critical point in a perpendicular magnetic field. We show that the form of the conductivity is sensitive to the presence of dissipation eta, and depends nonmonotonically on H once eta is weak enough. sigma(xy) passes through a maximum at Hsimilar toetaT in the quantum critical regime, suggesting that the limits H-->0 and eta-->0 do not commute.