Large thermoelectric power and figure of merit in a ferromagnetic-quantum dot-superconducting device

Abstract

We investigate the thermoelectric properties of a quantum dot coupled to ferromagnetic and superconducting electrodes. The combination of spin polarized tunneling at the ferromagnetic-quantum dot interface and the application of an external magnetic field that Zeeman splits the dot energy level leads to large values of the thermopower (Seebeck coefficient). Importantly, the thermopower can be tuned with an external gate voltage connected to the dot. We compute the figure of merit that measures the efficiency of thermoelectric conversion and find that it attains high values. We discuss the different contributions from Andreev reflection processes and quasiparticle tunneling into and out of the superconducting contact. Furthermore, we obtain dramatic variations of both the magnetothermopower and the spin Seebeck effect, which suggest that in our device spin currents can be controlled with temperature gradients only.

9 pages, 6 figures

References in corpus (18)

• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Hybrid superconductor-semiconductor devices made from self-assembled SiGe nanocrystals on silicon
• Scattering theory of nonlinear thermoelectric transport
• Observation of thermoelectric currents in high-field superconductor-ferromagnet tunnel junctions
• Onsager Relations in Coupled Electric, Thermoelectric and Spin Transport: The Ten-Fold Way
• Nanospintronics with carbon nanotubes
• Sign of the crossed conductances at a FSF double interface
• Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device
• Thermodynamics of the mesoscopic thermoelectric heat engine beyond the linear-response regime
• Spin-resolved Andreev transport through double-quantum-dot Cooper pair splitters
• Cross thermoelectric coupling in normal-superconductor quantum dots
• Electron-hole imbalance and large thermoelectric effect in superconducting hybrids with spin-active interfaces
• Spin-dependent thermoelectric effects in transport through a nanoscopic junction involving spin impurity
• Effect of magnetic anisotropy on spin-dependent thermoelectric effects in nanoscopic systems
• Fano resonance in a normal metal/ferromagnet-quantum dot-superconductor device

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• Odd-frequency Superconductivity Revealed by Thermopower
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• Spin-dependent thermoelectric effects in graphene based superconductor junctions
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• Superconductor-quantum dot hybrid coolers
• Phase and Thermal Driven Transport across T-Shaped Double Quantum Dot Josephson Junction
• Complete magnetic control over the superconducting thermoelectric effect
• Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads
• Properties of multiterminal superconducting nanostructure with double quantum dot
• Nonlinear heat transport in ferromagnetic-quantum dot-superconducting systems