Thermal Conductance of Ballistic Point Contacts

Th. Bartsch, M. Schmidt, Ch. Heyn, and W. Hansen
Phys. Rev. Lett. 108, 075901 – Published 14 February 2012

Abstract

We study the thermal conductance of ballistic point contacts. These contacts are realized as few nanometer long pillars in so-called air-gap heterostructures (AGHs). The pillar length is orders of magnitude smaller than the mean free path of the phonons up to room temperature. Because of the small dimension and the low density of the pillars, the thermal conductance of the AGHs is several orders of magnitude reduced in comparison to bulk structures. The measurement results are in quantitative agreement with a simple model that is based on the Boltzmann transport equation.

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  • Received 30 September 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.075901

© 2012 American Physical Society

Authors & Affiliations

Th. Bartsch, M. Schmidt, Ch. Heyn, and W. Hansen

  • Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Jungiusstraße 11, D-20355 Hamburg, Germany

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Issue

Vol. 108, Iss. 7 — 17 February 2012

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