Quantum Confinement Suppressing Electronic Heat Flow below the Wiedemann–Franz Law
(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
- Majidi, Danial ; Josefsson, Martin LU ; Kumar, Mukesh LU ; Leijnse, Martin LU ; Samuelson, Lars LU ; Courtois, Hervé ; Winkelmann, Clemens B. and Maisi, Ville F. LU
- organization
- publishing date
- 2022-01-26
- 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}}, }