Bulk versus surface: Nonuniversal partitioning of the topological magnetoelectric effect

Chao Lei, Perry T. Mahon, Allan H. MacDonald

The electronic ground state of a three-dimensional (3D) band insulator with time-reversal ($\hat{I}˜$) symmetry or time-reversal times a discrete translation ($\hat{I}˜T_{1/2}$) symmetry is cl…