Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

The thermoelectric effects of ferromagnetic topological insulators with either two-dimensional circular or one-dimensional domain wall skyrmions are studied theoretically. It is found that the topological spin-textures play a significant role in the manipulation of spin-dependent thermoelectric properties. In the vicinity of the charge neutrality point, spin Seebeck coefficients possess finite values whose sign and magnitude can be tuned by temperature in spite of vanishing charge Seebeck coefficients. The majority of the effects of circular skyrmions occurs in the edge-state transport regime by generating Fano antiresonances. While the domain wall skyrmion primarily influences the thermoelectric behaviors near the boundary between the edge-state and bulk-state transport regimes with the resonant tunneling mechanism. Both types of skyrmions which function effectively in distinct transport regimes have potential applications in thermoelectrics.

Automated summary

In this study, the thermoelectric effects of ferromagnetic topological insulators with two-dimensional circular or one-dimensional domain wall skyrmions are investigated. It is discovered that the topological spin textures play a crucial role in manipulating spin-dependent thermoelectric properties. Near the charge neutrality point, the spin Seebeck coefficients exhibit finite values that can be controlled by temperature, even though the charge Seebeck coefficients vanish. Circular skyrmions primarily affect edge-state transport regime by generating Fano antiresonances, while domain wall skyrmions influence the thermoelectric behaviors near the boundary between the edge-state and bulk-state transport regimes through resonant tunneling mechanism. Both types of skyrmions, with their effective functioning in distinct transport regimes, hold potential applications in thermoelectrics.