Wannier functions and ℤ2 invariants in time-reversal symmetric topological insulators
Wannier functions and ℤ2 invariants in time-reversal symmetric topological insulators
We provide a constructive proof of exponentially localized Wannier functions and related Bloch frames in 1- and 2-dimensional time-reversal symmetric (TRS) topological insulators. The construction is formulated in terms of periodic TRS families of projectors (corresponding, in applications, to the eigenprojectors on an arbitrary number of relevant energy bands), and …