We study three-terminal thermoelectric transport in a two-dimensional Quantum Point Contact (QPC) connected to left and right electronic reservoirs, as well as a third one represented by a scanning probe tip. The latter acts as a voltage probe exchanging heat with the system but no charges on average. The thermoelectric coefficients are calculated numerically within the Landauer–Büttiker formalism in the low-temperature and linear response regimes. We find tip-induced oscillations of the local and non-local thermopowers and study their dependence on the QPC opening. If the latter is tuned on a conductance plateau, the system behaves as a perfect thermoelectric diode: for some tip positions, the charge current through the QPC, driven by a local Seebeck effect, can flow in one direction only.
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26 July 2021
Research Article|
July 26 2021
Scanning probe-induced thermoelectrics in a quantum point contact
Geneviève Fleury
;
Geneviève Fleury
a)
1
Université Paris-Saclay, CEA, CNRS, SPEC
, 91191 Gif-sur-Yvette, France
a)Author to whom correspondence should be addressed: genevieve.fleury@cea.fr
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Cosimo Gorini
;
Cosimo Gorini
1
Université Paris-Saclay, CEA, CNRS, SPEC
, 91191 Gif-sur-Yvette, France
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Rafael Sánchez
Rafael Sánchez
2
Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid
, 28049 Madrid, Spain
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a)Author to whom correspondence should be addressed: genevieve.fleury@cea.fr
Appl. Phys. Lett. 119, 043101 (2021)
Article history
Received:
June 07 2021
Accepted:
July 13 2021
Citation
Geneviève Fleury, Cosimo Gorini, Rafael Sánchez; Scanning probe-induced thermoelectrics in a quantum point contact. Appl. Phys. Lett. 26 July 2021; 119 (4): 043101. https://doi.org/10.1063/5.0059220
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