Universität zu Köln

Rosenblatt, Amir, Konyzheva, Sofia, Lafont, Fabien, Schiller, Noam, Park, Jinhong, Snizhko, Kyrylo ORCID: 0000-0002-7236-6779, Heiblum, Moty, Oreg, Yuval and Umansky, Vladimir (2020). Energy Relaxation in Edge Modes in the Quantum Hall Effect. Phys. Rev. Lett., 125 (25). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Studies of energy flow in quantum systems complement the information provided by common conductance measurements. The quantum limit of heat flow in one-dimensional ballistic modes was predicted, and experimentally demonstrated, to have a universal value for bosons, fermions, and fractionally charged anyons. A fraction of this value is expected in non-Abelian states; harboring counterpropagating edge modes. In such exotic states, thermal-energy relaxation along the edge is expected, and can shed light on their topological nature. Here, we introduce a novel experimental setup that enables a direct observation of thermal-energy relaxation in chiral 1D edge modes in the quantum Hall effect. Edge modes, emanating from a heated reservoir, are partitioned by a quantum point contact (QPC) constriction, which is located at some distance along their path. The resulting low frequency noise, measured downstream, allows determination of the effective temperature of the edge mode at the location of the QPC. An expected, prominent energy relaxation was found in hole-conjugate states. However, relaxation was also observed in particlelike states, where heat is expected to be conserved. We developed a model, consisting of distance-dependent energy loss, which agrees with the observations; however, we cannot exclude energy redistribution mechanisms, which are not accompanied with energy loss.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rosenblatt, Amir UNSPECIFIED UNSPECIFIED UNSPECIFIED Konyzheva, Sofia UNSPECIFIED UNSPECIFIED UNSPECIFIED Lafont, Fabien UNSPECIFIED UNSPECIFIED UNSPECIFIED Schiller, Noam UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Jinhong UNSPECIFIED UNSPECIFIED UNSPECIFIED Snizhko, Kyrylo UNSPECIFIED orcid.org/0000-0002-7236-6779 UNSPECIFIED Heiblum, Moty UNSPECIFIED UNSPECIFIED UNSPECIFIED Oreg, Yuval UNSPECIFIED UNSPECIFIED UNSPECIFIED Umansky, Vladimir UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-307720
DOI:	10.1103/PhysRevLett.125.256803
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	125
Number:	25
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL CONDUCTANCE; SHOT-NOISE; TRANSPORT; THERMOMETRY; AGITATION; CHARGE; FLOW Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/30772