SEZIONE DI GENOVA
(D. Ferraro, N. Traverso Ziani) Under high magnetic field and at low temperatures, electronic interactions in a graphene give rise to exotic, strongly correlated many-body quantum Hall states. These states have been proposed for the implementation of new quantum circuits, for instance realizing topologically protected quantum computing. Although exciting, they remain poorly understood, because the conventional experimental approach for their investigation, dc electron transport, only yields limited information. In particular, electron transport only probes the physics of the current-carrying edge channels of the quantum Hall effect propagating along the edges of the electron gas, leaving the physics of the bulk unexplored. To gain a better understanding of these exotic states and their origin, we propose a new, unconventional approach, based on heat transport measurements, which directly probes the charge-neutral, heat-carrying collective modes characterizing these interactions-induced states. In this talk, I will introduce the principle of our heat transport measurements, and describe two recent results on the equilibration of heat along the edge in the fractional quantum Hall effect [1], and the thermal transport properties of the unusual insulating state emerging at zero energy in graphene under high magnetic field [2]. [1] Le Breton, et al., Phys. Rev. Lett. 129, 116803 (2022) [2] Delagrange, et al., Nature Physics 20, 1927 (2024)

DATA: 28-05-2025