High-Efficiency spin-Seebeck Diode in α’-Borophene FM/Normal/FM NanoribbonJunction

The α’-borophene nanoribbon (α’-BNR), due to its incredible properties such as high stability and great mobility of carriers, demonstrates high efficiency in thermoelectric devices. We show these properties enable producing a pure spin current by applying a temperature gradient with lower energy consumption in a ferromagnetic/normal/ferromagnetic (FM/Normal/FM) junction. Spin-dependent thermoelectric properties and spin-Seebeck are studied in this junction using the tight-binding (TB) formalism with the non-equilibrium Green's function method (NEGF). The pure spin current due to breaking the electron-hole symmetry is induced in the system, acting as a spin-Seebeck diode. Moreover, the negative differential spin-Seebeck effect is observed. Finally, we show that, under the same conditions, α’-BNR has a much higher power factor compared to graphene and silicene, due to the high asymmetry between the electrons and holes in α’-BNR. These exceptional features make α’-BNR a very suitable choice for thermoelectric devices.