Quantum Spin Models from Flux Tubes in Correlated Topological Insulators

Details Quantum Spin Models from Flux Tubes in Correlated Topological Insulators Quantum Spin Models from Flux Tubes in Correlated Topological Insulators

2012-04-20

arxiv.org/abs/1204.4728v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages/6 figures (Manuscript) + 4 pages/3 figures (Supplemental Material)

Scientific paper

We demonstrate that spin fluxon states generated by \pi\ fluxes can be used in quantum Monte Carlo simulations to identify a correlated Z_2 topological insulator. In the presence of repulsive electronic interactions, the spin fluxons form localized, low-energy spin-1/2 degrees of freedom with a distinct Curie law in the magnetic susceptibility. Electronic correlations generate a bosonic mode of magnetic excitons with tunable energy that act as exchange particles and mediate a dynamical spin-spin interaction of adjustable range and strength. In combination with the freedom to create almost arbitrary spin lattices, correlated topological insulators with \pi\ fluxes represent a novel kind of quantum simulator useful for numerical simulations and experiments.

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