Spiral Magnets as Gapless Mott Insulators

Details Spiral Magnets as Gapless Mott Insulators Spiral Magnets as Gapless Mott Insulators

1994-02-09

arxiv.org/abs/cond-mat/9402044v1

Europhys. Lett. 29, 37-42 (1995) (6 pages)

Physics

Condensed Matter

10 pages, REVTEX 3.0, 3 uuencoded postscript figures, CRPS-94-01

Scientific paper

10.1209/0295-5075/29/1/007

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 transverse spin-waves and charge excitations remain decoupled to all orders in $t/U$, it is shown that beyond leading order in $t/U$ the three Goldstone modes on the triangular lattice 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.

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