Vanishing bulk heat flow in the nu=0 quantum Hall ferromagnet in monolayer graphene

Abstract

Under high perpendicular magnetic field and at low temperatures, graphene develops an insulating state at the charge neutrality point. This state, dubbed $\nu =0$, is due to the interplay between electronic interactions and the four-fold spin and valley degeneracies in the flat band formed by the $n=0$ Landau level. Determining the ground state of $\nu =0$, including its spin and valley polarization, has been a theoretical and experimental undertaking for almost two decades. Here, we present experiments probing the bulk thermal transport properties of monolayer graphene at $\nu =0$, which directly probe its ground state and collective excitations. We observe a vanishing bulk thermal transport, in contradiction with the expected ground state, predicted to have a finite thermal conductance even at very low temperature. Our result highlight the need for further investigations on the nature of $\nu =0$.

arXiv commentContains Supplementary Information

References in corpus (36)

• Electronic Properties of Graphene in a Strong Magnetic Field
• Quantum Hall Ferromagnetism in Graphene
• The zero-energy state in graphene in a high magnetic field
• Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
• Quantum limit of heat flow across a single electronic channel
• Dissipative Quantum Hall Effect in Graphene near the Dirac Point
• Single-mode heat conduction by photons
• Graphene integer quantum Hall effect in the ferromagnetic and paramagnetic regimes
• Observed Quantization of Anyonic Heat Flow
• Phase diagram for the $\nu =0$ quantum Hall state in monolayer graphene
• Visualizing Broken Symmetry and Topological Defects in a Quantum Hall Ferromagnet
• Even denominator fractional quantum Hall states at an isospin transition in monolayer graphene
• Insulating behavior at the neutrality point in dual-gated, single-layer graphene
• Canted antiferromagnetic phase of the $\nu =0$ quantum Hall state in bilayer graphene
• Luttinger Liquid at the Edge of a Graphene Vacuum
• Theory of the Magnetic-Field-Induced Insulator in Neutral Graphene
• Fractional Exclusion Statistics and the Universal Quantum of Thermal Conductance: A Unifying Approach
• Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
• Helical quantum Hall phase in graphene on SrTiO${}_3$
• Imaging tunable quantum Hall broken-symmetry orders in graphene
• Electrical generation and detection of spin waves in a quantum Hall ferromagnet
• The Effects of Landau level mixing on the fractional quantum Hall effect in monolayer Graphene
• Vanishing thermal equilibration for hole-conjugate fractional quantum Hall states in graphene
• SO(5) symmetry in the quantum Hall effect in graphene
• Spin Superfluidity in the $\nu =0$ Quantum Hall State of Graphene
• Determination of topological edge quantum numbers of fractional quantum Hall phases
• Heat equilibration of integer and fractional quantum Hall edge modes in graphene
• Edge structure of graphene monolayers in the ν = 0 quantum Hall state
• SU(4) spin waves in the $\nu =\pm 1$ quantum Hall ferromagnet in graphene
• Global phase diagram of charge neutral graphene in the quantum Hall regime for generic interactions
• Scattering of magnons at graphene quantum-Hall-magnet junctions
• Theory of Competing Charge Density Wave, Kekule and Antiferromagnetic ordered Fractional Quantum Hall states in Graphene aligned with Boron Nitride
• Thermal Transport Signatures of Broken-Symmetry Phases in Graphene
• Symmetry characterization of the collective modes of the phase diagram of the $\nu =0$ quantum Hall state in graphene: Mean-field and spontaneously broken symmetries
• Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene
• Phase diagram of the $\nu =2$ quantum Hall state in bilayer graphene

Cited by in corpus (4)

• Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene
• Anomalous Transport Gaps of Fractional Quantum Hall Phases in Graphene Landau Levels are Induced by Spin-Valley Entangled Ground States
• Skyrmionic Transport and First Order Phase Transitions in Twisted Bilayer Graphene Quantum Hall Ferromagnet
• Uniquely identifying quantum Hall phases in charge neutral graphene