Correlated topological phases in 3D complex oxides via Green's functions

Details Correlated topological phases in 3D complex oxides via Green's functions Correlated topological phases in 3D complex oxides via Green's functions

2012-02-20

arxiv.org/abs/1202.4460v1

Physics

Condensed Matter

Strongly Correlated Electrons

7+3 pages, 4+1 figures

Scientific paper

We examine the effects of correlations on 3D topological insulators (TIs) as well as topological Weyl semimetals by using cellular dynamical mean-field theory (CDMFT). A model relevant to the pyrochlore iridates, a family of complex oxides that might harbour such phases, is used. We characterize the evolution of the topologically protected surface states and their disappearance for sufficiently strong interactions. We verify the bulk-boundary correspondence for correlated TIs by computing the quantized magneto-electric response coefficient using the interacting Green's function. This invariant also identifies a correlated axion insulator between a TI and Weyl semimetal, a feature absent in a simple mean-field treatment. We describe consequences for experiments and for the search for correlated materials with symmetry-protected topological order.

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