Topology driven quantum phase transitions in time-reversal invariant anyonic quantum liquids

TL;DR

This paper introduces a novel continuous quantum phase transition driven by topology fluctuations in anyonic quantum liquids, revealing a new type of critical state with potential implications for topological quantum matter.

Contribution

It presents an exact solution to a microscopic model of interacting anyons exhibiting a topology-driven quantum phase transition, unifying string nets and loop gases.

Findings

Discovery of a topology-driven quantum phase transition in anyonic liquids

Introduction of an exact solvable model for interacting anyons

Description of a critical state akin to a 'quantum foam' with topology fluctuations

Abstract

Indistinguishable particles in two dimensions can be characterized by anyonic quantum statistics more general than those of bosons or fermions. Such anyons emerge as quasiparticles in fractional quantum Hall states and certain frustrated quantum magnets. Quantum liquids of anyons exhibit degenerate ground states where the degeneracy depends on the topology of the underlying surface. Here we present a novel type of continuous quantum phase transition in such anyonic quantum liquids that is driven by quantum fluctuations of topology. The critical state connecting two anyonic liquids on surfaces with different topologies is reminiscent of the notion of a `quantum foam' with fluctuations on all length scales. This exotic quantum phase transition arises in a microscopic model of interacting anyons for which we present an exact solution in a linear geometry. We introduce an intuitive physical picture of this model that unifies string nets and loop gases, and provide a simple description of topological quantum phases and their phase transitions.