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Scanning probe-induced thermoelectrics in a quantum point contact

Abstract : 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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Contributor : Geneviève Fleury Connect in order to contact the contributor
Submitted on : Monday, August 16, 2021 - 3:40:57 PM
Last modification on : Wednesday, May 4, 2022 - 3:48:22 AM

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Geneviève Fleury, Cosimo Gorini, Rafael Sánchez. Scanning probe-induced thermoelectrics in a quantum point contact. Applied Physics Letters, American Institute of Physics, 2021, 119 (4), pp.043101. ⟨10.1063/5.0059220⟩. ⟨hal-03320865⟩



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