Lattice fermion models with supersymmetry

Abstract

We investigate a family of lattice models with manifest N=2 supersymmetry. The models describe fermions on a 1D lattice, subject to the constraint that no more than k consecutive lattice sites may be occupied. We discuss the special properties arising from the supersymmetry, and present Bethe ansatz solutions of the simplest models. We display the connections of the k=1 model with the spin-1/2 antiferromagnetic XXZ chain at Δ=-1/2, and the k=2 model with both the su(2|1)-symmetric tJ model in the ferromagnetic regime and the integrable spin-1 XXZ chain at Δ=-1/\sqrt{2}. We argue that these models include critical points described by the superconformal minimal models.

28 pages. v2: added new result on mapping to XXZ chain

References in corpus (3)

• Lattice Models with N=2 Supersymmetry
• The XXZ spin chain at $\Delta =-1/2$: Bethe roots, symmetric functions and determinants
• One dimensional strongly interacting Luttinger liquid of lattice spinless fermions

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