Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions

Abstract

We explore the role of proximity-induced odd-frequency pairing in the thermoelectricity of a ferromagnet when coupled to a conventional $s$-wave spin-singlet superconductor through a spin-active interface. By varying both the polarization and its direction in the ferromagnet and the interfacial spin-orbit interaction strength, we analyze the behavior of all proximity-induced pair amplitudes in the ferromagnet and their contributions to the thermoelectric coefficients. Based on our results for the Seebeck coefficient, we predict that odd-frequency spin-triplet Cooper pairs are much efficient than the conventional spin-singlet even-frequency pairs in enhancing thermoelectricity of the junction, especially mixed-spin triplet pairing is favorable. Our results on the thermoelectric figure of merit show that ferromagnet/superconductor junctions are very good thermoelectric systems when superconductivity is dominated by odd-frequency pairing.

arXiv commentPublished version

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• Thermoelectric detection of Andreev states in unconventional superconductors
• Exciting odd frequency equal-spin-triplet correlations at metal-superconductor interfaces
• Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions
• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Complete magnetic control over the superconducting thermoelectric effect
• Phase-dependent charge and heat current in thermally biased short Josephson junctions formed at helical edge states
• Yu-Shiba-Rusinov bound states boost odd-frequency superconductivity
• Thermodefect voltage in graphene nanoribbon junctions