Fractionalized topological insulators from frustrated spin models in three dimensions

Details Fractionalized topological insulators from frustrated spin models in three dimensions Fractionalized topological insulators from frustrated spin models in three dimensions

2012-02-01

arxiv.org/abs/1202.0291v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages (with supplementary materials); Typos corrected, figures enlarged and acknowledgements added

Scientific paper

We present a theory of three dimensional fractionalized topological insulators in the form of U(1) spin liquids with gapped fermionic spinons in the bulk and topologically protected gapless spinon surface states. Starting from a spin-1/2 model on a pyrochlore lattice, with frustrated antiferromagnetic and ferromagnetic exchange interactions, we show that decomposition of the latter interactions, within slave-fermion representation of the spins, can naturally give rise to an emergent spin-orbit coupling for the spinons. This stabilizes a fractionalized topological insulators which also have bulk bond spin-nematic order. Finally, we describe the low energy properties of these states.

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