Thermal Transport Signatures of Broken-Symmetry Phases in Graphene

Abstract

In the half-filled zero-energy Landau level of bilayer graphene, competing phases with spontaneously broken symmetries and an intriguing quantum critical behavior have been predicted. Here we investigate signatures of these broken-symmetry phases in thermal transport measurements. To this end we calculate the spectrum of spin and valley waves in the $\nu =0$ quantum Hall state of bilayer graphene. The presence of Goldstone modes enables heat transport even at low temperatures, which can serve as compelling evidence for spontaneous symmetry breaking. By varying external electric and magnetic fields it is possible to determine the nature of the symmetry breaking and temperature-dependent measurements may yield additional information about gapped modes.

5 pages, 3 figures, plus supplementary material

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Cited by in corpus (12)

• Even denominator fractional quantum Hall states at an isospin transition in monolayer graphene
• Electrical generation and detection of spin waves in a quantum Hall ferromagnet
• Gapless Spin Wave Transport through a Quantum Canted-Antiferromagnet
• Spin-Valley Coherent Phases of the $\nu =0$ Quantum Hall State in Bilayer Graphene
• Theory of Competing Charge Density Wave, Kekule and Antiferromagnetic ordered Fractional Quantum Hall states in Graphene aligned with Boron Nitride
• Aharonov-Bohm oscillations in bilayer graphene edge state Fabry-Pérot interferometers
• Superconducting critical temperature in the extended diffusive SYK model
• Scattering of magnons at graphene quantum-Hall-magnet junctions
• Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene
• Vanishing bulk heat flow in the nu=0 quantum Hall ferromagnet in monolayer graphene
• Trigonal warping induced terraced spin texture and nearly perfect spin polarization in graphene with Rashba effect
• Competing Laughlin state and Wigner crystal in bilayer graphene