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Enhanced Spin Thermopower in Phosphorene Nanoribbons via Edge-State Modifications
Junheng Ou1, Qingtian Zhang1,2
1School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Abstract:
We investigated spin-dependent thermoelectric transport in zigzag phosphorene nanoribbons with a ferromagnetic stripe. We explored the possibility to enhance the spin thermopower via modifications of the edge states in zigzag ribbons. Two methods are proposed to modulate the edge transport: one is applying gate voltages on the edges; the other is including notches on the ribbon edges. The transport gap is enlarged by the edge-state modifications, which enhance the charge and spin Seebeck coefficients almost twofold. Our results suggest phosphorene to be a promising material for thermoelectric applications and open a possibility to design a tunable spin-thermoelectric device.
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