Bulk topological invariants in noninteracting point group symmetric insulators
Bulk topological invariants in noninteracting point group symmetric insulators
We survey various quantized bulk physical observables in two- and three-dimensional topological band insulators invariant under translational symmetry and crystallographic point group symmetries (PGS). In two-dimensional insulators, we show that: (i) the Chern number of a $C_n$-invariant insulator can be determined, up to a multiple of $n$, by evaluating the …