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Issue 28, 2019
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Edge-modulated dual spin-filter effect in zigzag-shaped buckling Ag2S nanoribbons

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Abstract

Unlike MoS2, single-layered Ag2S nanoribbons (Ag2SNRs) exhibit a nonmetal-shrouded and a zigzag-shaped buckling structure and possess two distinct edges, S- or Ag-terminated ones. By performing first principle calculations, the spin-dependent electron transport of Ag2SNRs in a ferromagnetic state has been investigated. It is found that the SS- and AgAg-terminated Ag2SNRs exhibit semi-metallic characteristics, but with opposite spin-polarized directions. And AgS-terminated ones show metallic characteristics, but with completely spin-unpolarized transmission. That is to say, all three states, i.e., spin up polarized, spin down polarized and spin unpolarized ones, could be achieved by modulating the edge geometry. Further analysis shows that, the spatial separation on edges of the energy states with different spins around EF is responsible for the switch in the three states. The system could operate as a dual spin-filter, and the direction of the spin polarization can be switched by the edge morphology. Furthermore, calculations show that such a phenomenon is robust to the width of the ribbon and strain, showing great application potential.

Graphical abstract: Edge-modulated dual spin-filter effect in zigzag-shaped buckling Ag2S nanoribbons

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Article information


Submitted
04 May 2019
Accepted
20 Jun 2019
First published
26 Jun 2019

Phys. Chem. Chem. Phys., 2019,21, 15623-15629
Article type
Paper

Edge-modulated dual spin-filter effect in zigzag-shaped buckling Ag2S nanoribbons

J. Li, Y. Guo, H. Zeng, X. Mou and X. Yan, Phys. Chem. Chem. Phys., 2019, 21, 15623
DOI: 10.1039/C9CP02521A

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