Current noise in quantum dot thermoelectric engines
(2025) In Physical Review B 111(7).- Abstract
We theoretically investigate a thermoelectric heat engine based on a single-level quantum dot, calculating average quantities such as current, heat current, output power, and efficiency, as well as fluctuations (noise). Our theory is based on a diagrammatic expansion of the memory kernel together with counting statistics, and we investigate the effects of strong interactions and next-to-leading order tunneling. Accounting for next-to-leading order tunneling is crucial for a correct description when operating at high power and high efficiency, and in particular affect the qualitative behavior of the Fano factor and efficiency. We compare our results with the so-called thermodynamic uncertainty relations, which provide a lower bound on... (More)
We theoretically investigate a thermoelectric heat engine based on a single-level quantum dot, calculating average quantities such as current, heat current, output power, and efficiency, as well as fluctuations (noise). Our theory is based on a diagrammatic expansion of the memory kernel together with counting statistics, and we investigate the effects of strong interactions and next-to-leading order tunneling. Accounting for next-to-leading order tunneling is crucial for a correct description when operating at high power and high efficiency, and in particular affect the qualitative behavior of the Fano factor and efficiency. We compare our results with the so-called thermodynamic uncertainty relations, which provide a lower bound on the fluctuations for a given efficiency. In principle, the conventional thermodynamic uncertainty relations can be violated by the non-Markovian quantum effects originating from next-to-leading order tunneling, providing a type of quantum advantage. However, for the specific heat engine realization we consider here, we find that next-to-leading order tunneling does not lead to such violations, but in fact always pushes the results further away from the bound set by the thermodynamic uncertainty relations.
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- author
- Wozny, Simon LU and Leijnse, Martin LU
- organization
- publishing date
- 2025-02-15
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 111
- issue
- 7
- article number
- 075422
- publisher
- American Physical Society
- external identifiers
-
- scopus:85218348566
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.111.075422
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by "https://www.kb.se/samverkan-och-utveckling/oppen-tillgang-och-bibsamkonsortiet/bibsamkonsortiet.html"Bibsam.
- id
- 4374ec48-cfd7-49de-97ae-19c9958114be
- date added to LUP
- 2025-04-30 15:15:38
- date last changed
- 2025-05-05 08:55:49
@article{4374ec48-cfd7-49de-97ae-19c9958114be,
abstract = {{<p>We theoretically investigate a thermoelectric heat engine based on a single-level quantum dot, calculating average quantities such as current, heat current, output power, and efficiency, as well as fluctuations (noise). Our theory is based on a diagrammatic expansion of the memory kernel together with counting statistics, and we investigate the effects of strong interactions and next-to-leading order tunneling. Accounting for next-to-leading order tunneling is crucial for a correct description when operating at high power and high efficiency, and in particular affect the qualitative behavior of the Fano factor and efficiency. We compare our results with the so-called thermodynamic uncertainty relations, which provide a lower bound on the fluctuations for a given efficiency. In principle, the conventional thermodynamic uncertainty relations can be violated by the non-Markovian quantum effects originating from next-to-leading order tunneling, providing a type of quantum advantage. However, for the specific heat engine realization we consider here, we find that next-to-leading order tunneling does not lead to such violations, but in fact always pushes the results further away from the bound set by the thermodynamic uncertainty relations.</p>}},
author = {{Wozny, Simon and Leijnse, Martin}},
issn = {{2469-9950}},
language = {{eng}},
month = {{02}},
number = {{7}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Current noise in quantum dot thermoelectric engines}},
url = {{http://dx.doi.org/10.1103/PhysRevB.111.075422}},
doi = {{10.1103/PhysRevB.111.075422}},
volume = {{111}},
year = {{2025}},
}