Year: 2026
Type: article
Abstract: While the Hofstadter butterfly is commonly observed in moiré superlattices, its thermal properties have not been investigated, particularly the quantized heat flow expected for Chern insulators. Here we report the first thermal transport measurements in a graphene and hexagonal boron nitride moiré superlattice under high magnetic field. We observe a quantized heat flow, uniquely set by the topological invariant, for all investigated states of the Hofstadter butterfly: quantum Hall states, Chern insulators, and even symmetry-broken Chern insulators emerging from strong electronic interactions. Our work firmly establishes the universality of the quantization of heat transport and its intimate link with topology.
Source: Physical Review Letters
DOI: 10.1103/pggy-t8bg
Institutions: Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Université Paris Cité, Université Paris Sciences et Lettres, École Normale Supérieure - PSL, Sorbonne Université, Laboratoire de Physique de l'Ecole Normale Supérieure, Centre de Nanosciences et de Nanotechnologies, National Institute for Materials Science
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Laboratoire d’excellence Physique Atomes Lumière Matière, European Research Council, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Core Research for Evolutional Science and Technology
Awards: G1407809179, G2442584775, Physics: Atoms, Light, Matter, G392606314, G4091144171, G4162329948, G457735187, G4806815962, G5452052347, G7080048889, G708600390, G7240651115, Heat transport and spin polarization of non abelian quantum Hall states in graphene, G7376787254, G7486974924, Anyons in Quantum Circuits, Crafting Anyons with Quantum Circuits, G898758523
OpenAlex ID: W7206205859