| Issue |
Europhys. Lett.
Volume 41, Number 1, January I 1998
|
|
|---|---|---|
| Page(s) | 31 - 36 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00111-0 | |
| Published online | 01 September 2002 | |
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
Received:
25
July
1997
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
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