2D Fermion on the Strip with Boundary Defects as a CFT with Excited Spin Fields

TL;DR

This paper studies a 2D fermion system with boundary defects, demonstrating its conformal nature and interpreting defects as excited spin fields, while computing correlation functions without bosonization.

Contribution

It introduces a novel approach to understanding boundary defects as excited spin fields in a conformal fermion system, avoiding bosonization techniques.

Findings

The system remains conformal despite boundary defects.

Boundary defects can be interpreted as excited spin fields.

Correlation functions are computed without bosonization.

Abstract

We consider a two-dimensional fermion on the strip in the presence of an arbitrary number of zero-dimensional boundary changing defects. We show that the theory is still conformal with time dependent stress-energy tensor and that the allowed defects can be understood as excited spin fields. Finally we compute correlation functions involving these excited spin fields without using bosonization.