The Ground State Structure and Modular Transformations of Fractional Quantum Hall States on a Torus

TL;DR

This paper investigates the ground state structures of fractional quantum Hall states on a torus, revealing their relation to conformal field theory and identifying non-abelian characteristics in specific states.

Contribution

It establishes a connection between effective theory and wave functions, and demonstrates the non-abelian nature of the Haldane-Rezayi state through degeneracy analysis.

Findings

Non-abelian Berry phases match modular transformation matrices.

Haldane-Rezayi state has a tenfold degeneracy on a torus.

Ground state structure relates to conformal field theory characters.

Abstract

The structure of ground states of generic FQH states on a torus is studied by using both effective theory and electron wave function. The relation between the effective theory and the wave function becomes transparent when one considers the ground state structure. We find that the non-abelian Berry's phases of the abelian Hall states generated by twisting the mass matrix are identical to the modular transformation matrix for the characters of a Gaussian conformal field theory. We also show that the Haldane-Rezayi spin singlet state has a ten fold degeneracy on a torus which indicates such a state is a non-abelian Hall state.