Universität zu Köln

Melcer, Ron Aharon, Dutta, Bivas ORCID: 0000-0002-5354-3426, Spanslatt, Christian, Park, Jinhong ORCID: 0000-0001-6710-1031, Mirlin, Alexander D. and Umansky, Vladimir (2022). Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale. Nat. Commun., 13 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

The transport behaviour of counter-propagating edge modes in the hole-conjugate fractional quantum Hall state is not fully understood. Here, by combining local noise thermometry and thermal conductance measurements, the authors show the absence of thermal equilibration on the edge at macroscopic distances. 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Melcer, Ron Aharon UNSPECIFIED UNSPECIFIED UNSPECIFIED Dutta, Bivas UNSPECIFIED orcid.org/0000-0002-5354-3426 UNSPECIFIED Spanslatt, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Jinhong UNSPECIFIED orcid.org/0000-0001-6710-1031 UNSPECIFIED Mirlin, Alexander D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Umansky, Vladimir UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-687023
DOI:	10.1038/s41467-022-28009-0
Journal or Publication Title:	Nat. Commun.
Volume:	13
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NEUTRAL-MODES; TRANSPORT Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68702