Heat equilibration of integer and fractional quantum Hall edge modes in graphene

Abstract

Hole-conjugate states of the fractional quantum Hall effect host counter-propagating edge channels which are thought to exchange charge and energy. These exchanges have been the subject of extensive theoretical and experimental works; in particular, it is yet unclear if the presence of integer quantum Hall edge channels stemming from fully filled Landau levels affects heat equilibration along the edge. In this letter, we present heat transport measurements in quantum Hall states of graphene demonstrating that the integer channels can strongly equilibrate with the fractional ones, leading to markedly different regimes of quantized heat transport that depend on edge electrostatics. Our results allow for a better comprehension of the complex edge physics in the fractional quantum Hall regime.

Includes supplemental material

References in corpus (8)

• Realization of a High Mobility Dual-gated Graphene Field Effect Transistor with Al2O3 Dielectric
• Quantum limit of heat flow across a single electronic channel
• Observation of neutral modes in the fractional quantum Hall regime
• Primary thermometry triad at 6 mK in mesoscopic circuits
• Electronic heat flow and thermal shot noise in quantum circuits
• Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale
• High quality electrostatically defined hall bars in monolayer graphene
• How do edge states position themselves in a quantum Hall graphene pn junction?

Cited by in corpus (23)

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• Thermal Transport Imaging in the Quantum Hall Edge Channel
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