Quantized heat flow in graphene quantum Hall phases: Probing the topological order

TL;DR

This paper reviews recent experimental studies on quantized heat flow in graphene-based quantum Hall states, highlighting how thermal transport measurements reveal the topological order of these phases.

Contribution

It provides a comprehensive overview of thermal transport experiments in graphene quantum Hall states, emphasizing the role of heat flow in probing topological order.

Findings

Thermal Hall conductance quantization observed in graphene quantum Hall states.

Thermal transport measurements distinguish between different topological phases.

Insights into the topological order through heat flow in graphene systems.

Abstract

Topological quantum numbers are often used to characterise the topological order of phase having protected gapless edge modes when the system is kept in a space with the boundary. The famous examples in this category are the quantized electrical Hall conductance and thermal Hall conductance, which encodes the topological order of integer and fractional quantum Hall states. Here, we review the recent thermal transport study of integer and fractional quantum Hall states realized in graphene-based van der Waals heterostructures.