Quantum Confinement Suppressing Electronic Heat Flow below the Wiedemann–Franz Law

Danial Majidi, Martin Josefsson, Mukesh Kumar, Martin Leijnse, Lars Samuelson, Hervé Courtois, Clemens B. Winkelmann, Ville F. Maisi

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review


The Wiedemann–Franz law states that the charge conductance and the electronic contribution to the heat conductance are proportional. This sets stringent constraints on efficiency bounds for thermoelectric applications, which seek a large charge conduction in response to a small heat flow. We present experiments based on a quantum dot formed inside a semiconducting InAs nanowire transistor, in which the heat conduction can be tuned significantly below the Wiedemann–Franz prediction. Comparison with scattering theory shows that this is caused by quantum confinement and the resulting energy-selective transport properties of the quantum dot. Our results open up perspectives for tailoring independently the heat and electrical conduction properties in semiconductor nanostructures.

Sidor (från-till)630-635
Antal sidor6
TidskriftNano Letters
StatusPublished - 2022 jan. 26

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© 2022 American Chemical Society

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