Lattice fermion models with supersymmetry

Fendley, Paul; Nienhuis, Bernard; Schoutens, Kareljan

Lattice fermion models with supersymmetry

Authors

Fendley, Paul

Nienhuis, Bernard

Schoutens, Kareljan

Description

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