Midgap states of a two-dimensional antiferromagnetic Mott-insulator: Electronic structure of meron vortices
Department of Physics, University of Toronto, 60
St. George Street, Toronto, Ontario, Canada, M5S 1A7
Accepted: 13 November 1997
We demonstrate from first principles that ferromagnetic core, meron vortex configurations of the spin- 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.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1998