Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions

Abstract The thermoelectric voltage developed across an atomic metal junction (i.e., a nanostructure in which one or a few atoms connect two metal electrodes) in response to a temperature difference between the electrodes, results from the quantum interference of electrons that pass through the junc...

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Autores principales:	Akira Aiba, Firuz Demir, Satoshi Kaneko, Shintaro Fujii, Tomoaki Nishino, Kazuhito Tsukagoshi, Alireza Saffarzadeh, George Kirczenow, Manabu Kiguchi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ebbc9bf93a1145be817734a8d1dfb5ac
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spelling	oai:doaj.org-article:ebbc9bf93a1145be817734a8d1dfb5ac2021-12-02T11:52:16ZControlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions10.1038/s41598-017-08553-22045-2322https://doaj.org/article/ebbc9bf93a1145be817734a8d1dfb5ac2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08553-2https://doaj.org/toc/2045-2322Abstract The thermoelectric voltage developed across an atomic metal junction (i.e., a nanostructure in which one or a few atoms connect two metal electrodes) in response to a temperature difference between the electrodes, results from the quantum interference of electrons that pass through the junction multiple times after being scattered by the surrounding defects. Here we report successfully tuning this quantum interference and thus controlling the magnitude and sign of the thermoelectric voltage by applying a mechanical force that deforms the junction. The observed switching of the thermoelectric voltage is reversible and can be cycled many times. Our ab initio and semi-empirical calculations elucidate the detailed mechanism by which the quantum interference is tuned. We show that the applied strain alters the quantum phases of electrons passing through the narrowest part of the junction and hence modifies the electronic quantum interference in the device. Tuning the quantum interference causes the energies of electronic transport resonances to shift, which affects the thermoelectric voltage. These experimental and theoretical studies reveal that Au atomic junctions can be made to exhibit both positive and negative thermoelectric voltages on demand, and demonstrate the importance and tunability of the quantum interference effect in the atomic-scale metal nanostructures.Akira AibaFiruz DemirSatoshi KanekoShintaro FujiiTomoaki NishinoKazuhito TsukagoshiAlireza SaffarzadehGeorge KirczenowManabu KiguchiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Akira Aiba Firuz Demir Satoshi Kaneko Shintaro Fujii Tomoaki Nishino Kazuhito Tsukagoshi Alireza Saffarzadeh George Kirczenow Manabu Kiguchi Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
description	Abstract The thermoelectric voltage developed across an atomic metal junction (i.e., a nanostructure in which one or a few atoms connect two metal electrodes) in response to a temperature difference between the electrodes, results from the quantum interference of electrons that pass through the junction multiple times after being scattered by the surrounding defects. Here we report successfully tuning this quantum interference and thus controlling the magnitude and sign of the thermoelectric voltage by applying a mechanical force that deforms the junction. The observed switching of the thermoelectric voltage is reversible and can be cycled many times. Our ab initio and semi-empirical calculations elucidate the detailed mechanism by which the quantum interference is tuned. We show that the applied strain alters the quantum phases of electrons passing through the narrowest part of the junction and hence modifies the electronic quantum interference in the device. Tuning the quantum interference causes the energies of electronic transport resonances to shift, which affects the thermoelectric voltage. These experimental and theoretical studies reveal that Au atomic junctions can be made to exhibit both positive and negative thermoelectric voltages on demand, and demonstrate the importance and tunability of the quantum interference effect in the atomic-scale metal nanostructures.
format	article
author	Akira Aiba Firuz Demir Satoshi Kaneko Shintaro Fujii Tomoaki Nishino Kazuhito Tsukagoshi Alireza Saffarzadeh George Kirczenow Manabu Kiguchi
author_facet	Akira Aiba Firuz Demir Satoshi Kaneko Shintaro Fujii Tomoaki Nishino Kazuhito Tsukagoshi Alireza Saffarzadeh George Kirczenow Manabu Kiguchi
author_sort	Akira Aiba
title	Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
title_short	Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
title_full	Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
title_fullStr	Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
title_full_unstemmed	Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
title_sort	controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ebbc9bf93a1145be817734a8d1dfb5ac
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Controlling the thermoelectric effect by mechanical manipulation of the electron’s quantum phase in atomic junctions

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