A mean field approach for string condensed states

TL;DR

This paper introduces a mean field technique for quantum string models that can capture string condensed phases and phase transitions beyond traditional symmetry breaking, demonstrated on a Kagome lattice spin model.

Contribution

The paper presents a novel mean field approach capable of describing string condensed phases and complex phase transitions beyond Landau's paradigm.

Findings

Predicts multiple phases and phase transitions in the spin-1 XXZ Kagome model.

Identifies a z=2 deconfined quantum critical point.

Extends mean field methods to include string condensed states.

Abstract

We describe a mean field technique for quantum string (or dimer) models. Unlike traditional mean field approaches, the method is general enough to include string condensed phases in addition to the usual symmetry breaking phases. Thus, it can be used to study phases and phases transitions beyond Landau's symmetry breaking paradigm. We demonstrate the technique with a simple example: the spin-1 XXZ model on the Kagome lattice. The mean field calculation predicts a number of phases and phase transitions, including a z=2 deconfined quantum critical point.