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Edge-defect Induced Spin-Dependent Seebeck Effect and Spin Figure of Merit in Graphene Nanoribbons

Abstract

By using the first-principle calculations combined with non-equilibrium Green's function approach, we have studied spin caloritronic properties of graphene nanoribbons (GNRs) with different edge defects. The theoretical results show that the edge-defected GNRs with sawtooth shapes can exhibit spin-dependent currents with opposite flowing directions by applying temperature gradients, indicating the occurrence of spin-dependent Seebeck effect (SDSE). The edge defects bring about two opposite effects on the thermal spin currents: the enhancement of the symmetry of thermal spin-dependent currents, which contributes to the realization of pure thermal spin currents, and the decreasing of spin thermoelectric conversion efficiency of the devices. It is fortunate that applying a gate voltage is an efficient route to optimize these two opposite spin thermoelectric properties towards realistic device applications. Moreover, due to the existence of spin-splitting band gaps, the edge-defected GNRs can be designed as spin-dependent Seebeck diode and rectifier, indicating that the edge-defected GNRs are potential candidates for room-temperature spin caloritronic devices.

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Publication details

The article was received on 17 Aug 2017, accepted on 14 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP05621D
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Edge-defect Induced Spin-Dependent Seebeck Effect and Spin Figure of Merit in Graphene Nanoribbons

    Q. Liu, D. Wu and H. Fu, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05621D

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