Zhong Wang, Xiao-Liang Qi, Shou-Cheng Zhang
For interacting Z_2 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. We derive this result from our previous formula involving the integral
over the frequency-momenta space. This formula greatly simplifies the explicit
calculation of Z_2 topological invariants in inversion symmetric insulators
with strong interactions.
View original:
http://arxiv.org/abs/1201.6431
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