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 more efficient than the conventional spin-singlet even-frequency pairs in enhancing thermoelectricity of the junction, and 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.

Thermodefect voltage in graphene nanoribbon junctions

“…In semiconducting AGNR junctions with Stone-Wales or 555-777 defects, we find thermodefect voltages as large as 1.45 mV K −1 and 1.7 mV K −1 , respectively, at room temperature. This can be compared to the conventional semiconducting [59] and ferromagnet-superconductor hybrid thermoelectric junctions [60][61][62] that usually produce voltages around sub-mV K −1 or μV K −1 , showing the impressive prospects of the present work for thermoelectric applications.…”

Thermodefect voltage in graphene nanoribbon junctions

“…In semiconducting AGNR junctions with Stone-Wales or 555-777 defects, we find thermodefect voltages as large as 1.45 mV/K and 1.7 mV/K, respectively, at room temperature. This can be compared to the conventional semiconducting [49] and ferromagnet-superconductor hybrid thermoelectric junctions [50][51][52] that usually produce voltages around sub-mV/K or µV/K, showing the impressive prospects of the present work for thermoelectric applications.…”

The enhanced effect of magnetism on the thermoelectric performance of a CrI3 monolayer

“…23 P. Dutta et al found that a ferromagnet/superconductor junction is an excellent TE system under certain conditions. 24 Y. Fujine et al investigated the magnetic and TE properties of a La 0.8 Sc 0.2 Co 1−z M z O 3 system and found that the Seebeck coefficient is strongly correlated with the behavior of magnetization. 25 All the above studies demonstrate that magnetism has a novel effect on the TE performance.…”