Bulk effective theory in coupled wire construction from generalized Wilson line

TL;DR

This paper reveals the hidden bulk structure in coupled wire models of topological states by introducing a generalized Wilson line, demonstrating that the bulk theory is a U(1) Chern-Simons gauge theory with edge states described by chiral Luttinger theory.

Contribution

It introduces a generalized Wilson line and a new gauge field to uncover the bulk structure, showing it corresponds to a U(1) Chern-Simons theory in coupled wire constructions.

Findings

Bulk theory is U(1) Chern-Simons gauge theory.

Edge theory is chiral Luttinger theory.

Method demonstrated for Laughlin and chiral spin liquid states.

Abstract

We reconsider the coupled wire construction, which is a useful method of obtaining two and three-dimensional topologically ordered states from an array of one-dimensional CFTs, and show that there is the hidden structure in the bulk of the constructed model. In order to uncover the structure hidden in the gapped bulk, we introduce a generalized Wilson line and show the necessity of introducing a new gauge field, which behaves like the Chern-Simons gauge field. From these examination, it is possible to show that in this formulation the bulk theory is the U(1) Chern-Simons gauge theory and the edge theory is the chiral Luttinger theory. We explicitly demonstrate our method for the Laughlin states and the chiral spin liquid state.