Detailed analysis of the continuum limit of a supersymmetric lattice model in 1D

TL;DR

This paper establishes a detailed correspondence between a supersymmetric lattice model of spinless fermions in 1D and its continuum limit described by an $ ext{N}=(2,2)$ superconformal field theory, providing tools to analyze supersymmetric systems.

Contribution

It provides a comprehensive mapping between lattice model states/operators and SCFT fields, and introduces a spectral flow-based method to study supersymmetric models.

Findings

Identified lattice states with SCFT fields.

Linked boundary conditions to field theory sectors.

Explained numerical particle density properties.

Abstract

We present a full identification of lattice model properties with their field theoretical counter parts in the continuum limit for a supersymmetric model for itinerant spinless fermions on a one dimensional chain. The continuum limit of this model is described by an $\mathcal{N}=(2,2)$ superconformal field theory (SCFT) with central charge c=1. We identify states and operators in the lattice model with fields in the SCFT and we relate boundary conditions on the lattice to sectors in the field theory. We use the dictionary we develop in this paper, to give a pedagogical explanation of a powerful tool to study supersymmetric models based on spectral flow. Finally, we employ the developed machinery to explain numerically observed properties of the particle density on the open chain presented in Beccaria et al. PRL 94:100401 (2005).