Nonlinear thermovoltage and thermocurrent in quantum dots
Fahlvik Svensson, Sofia LU ; Hoffmann, E. A. ; Nakpathomkun, N. ; Wu, Phillip LU ; Xu, Hongqi LU ; Nilsson, Henrik LU ; Sanchez, D. ; Kashcheyevs, V. and Linke, Heiner LU
(2013)
In New Journal of Physics
15.
- Abstract
- Quantum dots are model systems for quantum thermoelectric behavior because of their ability to control and measure the effects of electron-energy filtering and quantum confinement on thermoelectric properties. Interestingly, nonlinear thermoelectric properties of such small systems can modify the efficiency of thermoelectric power conversion. Using quantum dots embedded in semiconductor nanowires, we measure thermovoltage and thermocurrent that are strongly nonlinear in the applied thermal bias. We show that most of the observed nonlinear effects can be understood in terms of a renormalization of the quantum-dot energy levels as a function of applied thermal bias and provide a theoretical model of the nonlinear thermovoltage taking... (More)
- Quantum dots are model systems for quantum thermoelectric behavior because of their ability to control and measure the effects of electron-energy filtering and quantum confinement on thermoelectric properties. Interestingly, nonlinear thermoelectric properties of such small systems can modify the efficiency of thermoelectric power conversion. Using quantum dots embedded in semiconductor nanowires, we measure thermovoltage and thermocurrent that are strongly nonlinear in the applied thermal bias. We show that most of the observed nonlinear effects can be understood in terms of a renormalization of the quantum-dot energy levels as a function of applied thermal bias and provide a theoretical model of the nonlinear thermovoltage taking renormalization into account. Furthermore, we propose a theory that explains a possible source of the observed, pronounced renormalization effect by the melting of Kondo correlations in the mixed-valence regime. The ability to control nonlinear thermoelectric behavior expands the range in which quantum thermoelectric effects may be used for efficient energy conversion. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4160439
- author
- Fahlvik Svensson, Sofia
LU
; Hoffmann, E. A.
; Nakpathomkun, N.
; Wu, Phillip
LU
; Xu, Hongqi
LU
; Nilsson, Henrik
LU
; Sanchez, D.
; Kashcheyevs, V.
and Linke, Heiner
LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- New Journal of Physics
- volume
- 15
- article number
- 105011
- publisher
- IOP Publishing
- external identifiers
-
- wos:000325685400002
- scopus:84886533294
- ISSN
- 1367-2630
- DOI
- 10.1088/1367-2630/15/10/105011
- language
- English
- LU publication?
- yes
- id
- 5ec94b5e-a979-4535-b9ce-59f36a2d8239 (old id 4160439)
- date added to LUP
- 2016-04-01 14:48:04
- date last changed
- 2023-11-13 12:26:49
@article{5ec94b5e-a979-4535-b9ce-59f36a2d8239,
abstract = {{Quantum dots are model systems for quantum thermoelectric behavior because of their ability to control and measure the effects of electron-energy filtering and quantum confinement on thermoelectric properties. Interestingly, nonlinear thermoelectric properties of such small systems can modify the efficiency of thermoelectric power conversion. Using quantum dots embedded in semiconductor nanowires, we measure thermovoltage and thermocurrent that are strongly nonlinear in the applied thermal bias. We show that most of the observed nonlinear effects can be understood in terms of a renormalization of the quantum-dot energy levels as a function of applied thermal bias and provide a theoretical model of the nonlinear thermovoltage taking renormalization into account. Furthermore, we propose a theory that explains a possible source of the observed, pronounced renormalization effect by the melting of Kondo correlations in the mixed-valence regime. The ability to control nonlinear thermoelectric behavior expands the range in which quantum thermoelectric effects may be used for efficient energy conversion.}},
author = {{Fahlvik Svensson, Sofia and Hoffmann, E. A. and Nakpathomkun, N. and Wu, Phillip and Xu, Hongqi and Nilsson, Henrik and Sanchez, D. and Kashcheyevs, V. and Linke, Heiner}},
issn = {{1367-2630}},
language = {{eng}},
publisher = {{IOP Publishing}},
series = {{New Journal of Physics}},
title = {{Nonlinear thermovoltage and thermocurrent in quantum dots}},
url = {{http://dx.doi.org/10.1088/1367-2630/15/10/105011}},
doi = {{10.1088/1367-2630/15/10/105011}},
volume = {{15}},
year = {{2013}},
}