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Midgap states of a two-dimensional antiferromagnetic Mott-insulator: Electronic structure of meron vortices

We demonstrate from first principles that ferromagnetic core, meron vortex configurations of the spin-½ antiferromagnet in two-dimensions give rise to midgap electronic states in the Mott-Hubbard charge gap. Merons are collective mode excitations of the antiferromagnet and are induced by doping the system with charge carriers. They are the topological analogs of charged bosonic domain wall solitons in one-dimension.