Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale
Artikel i vetenskaplig tidskrift, 2022

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.

Författare

Ron Aharon Melcer

Weizmann Institute of Science

Bivas Dutta

Weizmann Institute of Science

Christian Spånslätt Rugarn

Karlsruher Institut für Technologie (KIT)

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Jinhong Park

Universität zu Köln

Alexander D. Mirlin

Petersburg Nuclear Physics Institute (PNPI)

Karlsruher Institut für Technologie (KIT)

Landau Institute for Theoretical Physics

Vladimir Umansky

Weizmann Institute of Science

Nature Communications

2041-1723 (ISSN)

Vol. 13 1 376

Ämneskategorier

Annan fysik

Fusion, plasma och rymdfysik

Den kondenserade materiens fysik

DOI

10.1038/s41467-022-28009-0

PubMed

35046393

Mer information

Senast uppdaterat

2022-02-02