Spiral Magnets As Gapless Mott Insulators
| Titre | Spiral Magnets As Gapless Mott Insulators |
| Type de publication | Journal Article |
| Nouvelles publications | 1995 |
| Auteurs | Côté R, Tremblay A-MS |
| Journal | Europhysics Letters |
| Volume | 29 |
| Pagination | 37–42 |
| Année de publication | 01/1995 |
| Résumé | In the large-U limit, the ground state of the half-filled, nearest-neighbor Hubbard model on the triangular lattice is the three-sublattice antiferromagnet. In sharp contrast with the square-lattice case, where Goldstone modes never have a charge component, it is shown that beyond leading order in t/U the three Goldstone modes on the triangular lattice, at finite q, are a linear combination of spin and charge. This leads to non-vanishing conductivity at any finite frequency, even though the magnet remains insulating at zero frequency. More generally, non-collinear spin order should lead to such gapless insulating behavior. |
| URL | http://stacks.iop.org/0295-5075/29/37 |
