Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-01-31
Phys. Rev. B 85, 165126 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
Fig.2 added. Published version
Scientific paper
10.1103/PhysRevB.85.165126
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.
Qi Xiao-Liang
Wang Zhong
Zhang Shou-Cheng
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