Interaction Correction to the Magneto-Electric Polarizability of $Z_2$ Topological Insulators

Karin Everschor-Sitte, Matthias Sitte, Allan H. MacDonald

When time-reversal symmetry is weakly broken and interactions are neglected, the surface of a $Z_2$ topological insulator supports a half-quantized Hall conductivity $σ_{S} = e^{…