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Quantum thermal conductance of electrons in a one-dimensional wire

Chiatti, O; Nicholls, JT; Proskuryakov, YY; Lumpkin, N; Farrer, I; Ritchie, DA; (2006) Quantum thermal conductance of electrons in a one-dimensional wire. Physical Review Letters , 97 (5) , Article 056601. 10.1103/PhysRevLett.97.056601. Green open access

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Abstract

We use an electron thermometer to measure the temperature rise of approximately 2x10(5) electrons in a two-dimensional box, due to heat flow into the box through a ballistic one-dimensional (1D) constriction. Using a simple model we deduce the thermal conductance kappa(V-g) of the 1D constriction, which we compare to its electrical conductance characteristics; for the first four 1D subbands the heat carried by the electrons passing through the wire is proportional to its electrical conductance G(V-g). In the vicinity of the 0.7 structure this proportionality breaks down, and a plateau at the quantum of thermal conductance pi(2)k(B)(2)T/3h is observed.

Type: Article
Title: Quantum thermal conductance of electrons in a one-dimensional wire
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.97.056601
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.97.056601
Language: English
Additional information: © 2006 The American Physical Society
Keywords: POINT CONTACTS, GAS, QUANTIZATION, TRANSPORT
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/20434
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