Large-$U$ limit of a Hubbard model in a magnetic field: chiral spin interactions and paramagnetism

Abstract

We consider the large-$U$ limit of the one-band Hubbard model at half-filling on a non-bipartite two-dimensional lattice. An external magnetic field can induce a three-spin chiral interaction at order $1/U^2$. We discuss situations in which, at low temperatures, the chiral term may have a larger effect than the Pauli coupling of electron spins to a magnetic field. We present a model which explicitly demonstrates this. The ground state is a singlet with a gap; hence the spin susceptibility is zero while the chiral susceptibility is finite and paramagnetic.

12 pages, plain TeX, one figure available on request, to appear in Phys. Rev. B

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