NC Branes and Hierarchies in Quantum Hall Fluids

TL;DR

This paper models hierarchical fractional quantum Hall states using non-commutative Chern-Simons theory, revealing specific order parameters and extending quantum Hall solitons beyond Laughlin states.

Contribution

It introduces a matrix-based description of hierarchy levels and predicts a third order tensor of order parameters influenced by magnetic fields.

Findings

Order parameter matrix $K_{ab}$ expressed via trace of matrices.

Existence of a third order tensor $C_{abc}$ related to external magnetic field.

Generalized quantum Hall soliton extending Laughlin state.

Abstract

We develop the non commutative Chern-Simons gauge model analysis modeling the description of the hierarchical states of fractional quantum Hall fluids. For a generic level $n$ of the hierarchy, we show that the order parameter matrix $K_{ab}$ is given by $ \theta^{-2}Tr(\tau_a \tau_b)$, where $\{\tau_a, 1\leq a \leq n \}$ define a specific set of $n\times n$ matrices depending on the parameter $\theta$ and the levels $l_a$ of the CS effective field theory. Our analysis predicts the existence of a third order tensor of order parameters $C_{abc}$ induced by the external magnetic field. It is shown that the $C_{abc}$'s are not new order parameters and are given by $\theta d_{abc}$, where $d_{abc}$ are numbers depending on the $l_a$'s. We also give the generalized quantum Hall soliton extending the one obtained in the case of the Laughlin state.