Sign reversals of the Quantum Hall Effect in quasi-1D conductors

TL;DR

This paper explains the sign reversals of the Quantum Hall Effect in quasi-1D conductors using the quantized nesting model, linking Fermi surface geometry changes to the phenomenon and stability differences between phases.

Contribution

It introduces a theoretical explanation for sign reversals in the Quantum Hall Effect specific to quasi-1D conductors, highlighting the role of Fermi surface geometry modifications.

Findings

Sign reversals are driven by Fermi surface geometry changes.

Only even phases exhibit sign reversals.

Negative phases are less stable than positive ones.

Abstract

The sign reversals of the Quantum Hall Effect observed in quasi-one-dimensional conductors of the Bechgaard salts family are explained within the framework of the quantized nesting model. The sequence of reversals is driven by slight modifications of the geometry of the Fermi surface. It is explained why only even phases can have signign reversals and why negative phases are less stable than positive ones.