Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale

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 point of the edge modes. Such understanding of the thermal equilibration on edges with counter-propagating modes is a natural route towards extracting the topological order of the exotic 5/2 state.

Dutta, BivasWeizmann Institute of Science (författare)
Spånslätt Rugarn, Christian,1987Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)spanslat (författare)
Park, JinhongUniversität zu Köln,University of Cologne (författare)
Mirlin, Alexander D.Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT),Landau Institute for Theoretical Physics (författare)
Umansky, VladimirWeizmann Institute of Science (författare)
Weizmann Institute of ScienceKarlsruher Institut für Technologie (KIT) (creator_code:org_t)

Ingår i:Nature Communications: Springer Science and Business Media LLC13:12041-17232041-1723

Av författaren/redakt...: Melcer, Ron Ahar ...; Dutta, Bivas; Spånslätt Rugarn ...; Park, Jinhong; Mirlin, Alexande ...; Umansky, Vladimi ...

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