Spin thermoelectric eﬀects of skyrmions in ferromagnetic topological insulators


 The thermoelectric eﬀects of ferromagnetic topological insulators with either two-dimensional (2D) circular or one-dimensional (1D) 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.