Abstract
For interacting topological insulators with inversion symmetry, we propose a simple topological invariant expressed in terms of the parity eigenvalues of the interacting Green's function at time-reversal invariant momenta and zero frequency. We derive this result from our previous formula involving the integral over the frequency-momenta space. This formula greatly simplifies the explicit calculation of topological invariants in inversion-symmetric insulators with strong interactions.
- Received 31 January 2012
DOI:https://doi.org/10.1103/PhysRevB.85.165126
©2012 American Physical Society