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Largely Enhanced Thermoelectric Effect and Pure Spin Current in Silicene-based devices under Hydrogen Modification

Abstract

Based on the density functional theory and the nonequilibrium Green's function methods, we launch a systematic study of the magnetic properties and thermoelectric effects in silicene-based devices constructed by zigzag silicene nanoribbons (ZSiNRs). By modulating the adsorption site, it is found that the ground state of ZSiNRs varies from an antiferromagnetic state to a ferromagnetic state. Meanwhile, a spin-degenerated semiconductor evolves into a spin semiconductor. The spin and charge thermoelectric figure of merits have an almost equal value of about 60 in the narrow device, which originates from the spin-dependent conductance dips and high spin-filtering effects. Moreover, a thermally-driven pure spin current in the silicene-based devices is obtained in the absence of the gate voltage, and its magnitude is effectively enhanced as the device width increases. Our results suggest that the silicene-based devices have very good prospects for spin calortronics.

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Publication details

The article was received on 31 Aug 2019, accepted on 15 Nov 2019 and first published on 15 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR07541K
Nanoscale, 2019, Accepted Manuscript

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    Largely Enhanced Thermoelectric Effect and Pure Spin Current in Silicene-based devices under Hydrogen Modification

    G. Qiao, F. Tan, L. Yang, X. Yang and Y. Liu, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR07541K

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