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

Majidi, Danial ; Josefsson, Martin LU orcid ; Kumar, Mukesh LU ; Leijnse, Martin LU ; Samuelson, Lars LU ; Courtois, Hervé ; Winkelmann, Clemens B. and Maisi, Ville F. LU (2022) In Nano Letters 22(2). p.630-635
Abstract

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... (More)

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.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
heat transport, quantum dot junction, scattering theory, Wiedemann−Franz law
in
Nano Letters
volume
22
issue
2
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:35030004
  • scopus:85123878118
ISSN
1530-6984
DOI
10.1021/acs.nanolett.1c03437
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 American Chemical Society
id
bcdc3796-365c-4fbb-8eb7-a4955068632b
date added to LUP
2022-02-15 17:23:51
date last changed
2024-04-18 05:41:23
@article{bcdc3796-365c-4fbb-8eb7-a4955068632b,
  abstract     = {{<p>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.</p>}},
  author       = {{Majidi, Danial and Josefsson, Martin and Kumar, Mukesh and Leijnse, Martin and Samuelson, Lars and Courtois, Hervé and Winkelmann, Clemens B. and Maisi, Ville F.}},
  issn         = {{1530-6984}},
  keywords     = {{heat transport; quantum dot junction; scattering theory; Wiedemann−Franz law}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  pages        = {{630--635}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{Quantum Confinement Suppressing Electronic Heat Flow below the Wiedemann–Franz Law}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.1c03437}},
  doi          = {{10.1021/acs.nanolett.1c03437}},
  volume       = {{22}},
  year         = {{2022}},
}