Advanced

Experiments on the thermoelectric properties of quantum dots

Svilans, Artis LU ; Leijnse, Martin LU and Linke, Heiner LU (2016) In Comptes Rendus Physique 17(10). p.1096-1108
Abstract

Quantum dots (QDs) are good model systems for fundamental studies of mesoscopic transport phenomena using thermoelectric effects because of their small size, electrostatically tunable properties and thermoelectric response characteristics that are very sensitive to small thermal biases. Here we provide a review of experimental studies on thermoelectric properties of single QDs realized in two-dimensional electron gases, single-walled carbon nanotubes and semiconductor nanowires. A key requirement for such experiments is to have some methods for nanoscale thermal biasing at one's disposal. We briefly review the main techniques used in the field, namely, heating of the QD contacts, side heating and top heating, and touch upon their... (More)

Quantum dots (QDs) are good model systems for fundamental studies of mesoscopic transport phenomena using thermoelectric effects because of their small size, electrostatically tunable properties and thermoelectric response characteristics that are very sensitive to small thermal biases. Here we provide a review of experimental studies on thermoelectric properties of single QDs realized in two-dimensional electron gases, single-walled carbon nanotubes and semiconductor nanowires. A key requirement for such experiments is to have some methods for nanoscale thermal biasing at one's disposal. We briefly review the main techniques used in the field, namely, heating of the QD contacts, side heating and top heating, and touch upon their relative advantages. The thermoelectric response of a QD as a function of gate potential has a characteristic oscillatory behavior with the same period as is observed for conductance peaks. Much of the existing literature focuses on the agreement between experiments and theory, particularly for amplitude and line-shape of the thermovoltage Vth. A general observation is that the widely used single-electron tunneling approximation for QDs has limited success in reproducing measured Vth. Landauer-type calculations are often found to describe measurement results better, despite the large electron–electron interactions in QDs. More recently, nonlinear thermoelectric effects have moved into the focus of attention, and we offer a brief overview of the experiments done so far. We conclude by discussing open questions and avenues for future work, including the role of asymmetries in tunnel- and capacitive couplings in the thermoelectric behavior of QDs.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nanoscale, Quantum dot, Thermal bias, Thermoelectric, Thermopower
in
Comptes Rendus Physique
volume
17
issue
10
pages
13 pages
publisher
Editions scientifiques Elsevier
external identifiers
  • scopus:84994126377
  • wos:000387445000006
ISSN
1631-0705
DOI
10.1016/j.crhy.2016.08.002
language
English
LU publication?
yes
id
beac1d17-fe2a-407a-b3d6-bbe6e6f05a06
date added to LUP
2016-12-02 07:41:39
date last changed
2017-09-17 09:33:28
@article{beac1d17-fe2a-407a-b3d6-bbe6e6f05a06,
  abstract     = {<p>Quantum dots (QDs) are good model systems for fundamental studies of mesoscopic transport phenomena using thermoelectric effects because of their small size, electrostatically tunable properties and thermoelectric response characteristics that are very sensitive to small thermal biases. Here we provide a review of experimental studies on thermoelectric properties of single QDs realized in two-dimensional electron gases, single-walled carbon nanotubes and semiconductor nanowires. A key requirement for such experiments is to have some methods for nanoscale thermal biasing at one's disposal. We briefly review the main techniques used in the field, namely, heating of the QD contacts, side heating and top heating, and touch upon their relative advantages. The thermoelectric response of a QD as a function of gate potential has a characteristic oscillatory behavior with the same period as is observed for conductance peaks. Much of the existing literature focuses on the agreement between experiments and theory, particularly for amplitude and line-shape of the thermovoltage V<sub>th</sub>. A general observation is that the widely used single-electron tunneling approximation for QDs has limited success in reproducing measured V<sub>th</sub>. Landauer-type calculations are often found to describe measurement results better, despite the large electron–electron interactions in QDs. More recently, nonlinear thermoelectric effects have moved into the focus of attention, and we offer a brief overview of the experiments done so far. We conclude by discussing open questions and avenues for future work, including the role of asymmetries in tunnel- and capacitive couplings in the thermoelectric behavior of QDs.</p>},
  author       = {Svilans, Artis and Leijnse, Martin and Linke, Heiner},
  issn         = {1631-0705},
  keyword      = {Nanoscale,Quantum dot,Thermal bias,Thermoelectric,Thermopower},
  language     = {eng},
  month        = {12},
  number       = {10},
  pages        = {1096--1108},
  publisher    = {Editions scientifiques Elsevier},
  series       = {Comptes Rendus Physique},
  title        = {Experiments on the thermoelectric properties of quantum dots},
  url          = {http://dx.doi.org/10.1016/j.crhy.2016.08.002},
  volume       = {17},
  year         = {2016},
}