Temperature-induced phase transitions in the quantum Hall magnet of bilayer graphene

TL;DR

This study investigates how temperature affects phase transitions in the quantum Hall magnet of bilayer graphene, revealing a two-step transition process crucial for understanding electron correlations.

Contribution

It provides the first detailed measurement of temperature-induced phase transitions in the quantum Hall antiferromagnetic state of bilayer graphene.

Findings

Identified a two-step phase transition process.

Revealed the breaking of long-range and short-range order.

Enhanced understanding of electron correlations in quantum Hall systems.

Abstract

The quantum Hall system can be used to study many-body physics owing to its multiple internal electronic degrees of freedom and tunability. While quantum phase transitions have been studied intensively, research on the temperature-induced phase transitions of this system is limited. We measured the pure bulk conductivity of a quantum Hall antiferromagnetic state in bilayer graphene over a wide range of temperatures and revealed the two-step phase transition associated with the breaking of the long-range order and short-range antiferromagnetic order. Our findings are fundamental to understanding electron correlation in quantum Hall systems.