Thermovoltage in quantum dots with attractive interaction

Abstract

We study the linear and nonlinear thermovoltage of a quantum dot with effective attractive electron-electron interaction and weak, energy-dependent tunnel-coupling to electronic contacts. Remarkably, we find that the thermovoltage shows signatures of repulsive interaction which can be rationalized. These thermovoltage characteristics are robust against large potential and temperature differences well into the nonlinear regime, which we expect can be demonstrated in current state-of-the-art experiments. Furthermore, under nonlinear operation, we find extended regions of large power production at efficiencies on the order of the Curzon-Ahlborn bound interrupted only by a characteristic sharp dip.

arXiv comment5 pages, 4 figures. Supplementary material to the article can be downloaded under ancilliary files in the menu on the right. This article appeared in Appl. Phys. Lett. 116, 243103 (2020) and may be found at https://doi.org/10.1063/5.0008866 . This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing

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• Geometric energy transport and refrigeration with driven quantum dots
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• Solution of master equations by fermionic-duality: Time-dependent charge and heat currents through an interacting quantum dot proximized by a superconductor
• Fermionic duality: General symmetry of open systems with strong dissipation and memory