Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale.

ABSTRACT: Two-dimensional topological insulators, and in particular quantum Hall states, are characterized by an insulating bulk and a conducting edge. Fractional states may host both downstream (dictated by the magnetic field) and upstream propagating edge modes, which leads to complex transport behavior. Here, we combine two measurement techniques, local noise thermometry and thermal conductance, to study thermal properties of states with counter-propagating edge modes. We find that, while charge equilibration between counter-propagating edge modes is very fast, the equilibration of heat is extremely inefficient, leading to an almost ballistic heat transport over macroscopic distances. Moreover, we observe an emergent quantization of the heat conductance associated with a strong interaction fixed

SUBMITTER: Melcer RA 

PROVIDER: S-EPMC8770503 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature