Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions

doi:https://doi.org/10.1063/1.4884424

Title: Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions

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Abstract

We propose a high-efficiency thermospin device constructed by a carbon atomic chain sandwiched between two ferromagnetic (FM) zigzag graphene nanoribbon electrodes. In the low-temperature regime, the magnitude of the spin figure of merit is nearly equal to that of the corresponding charge figure of merit. This is attributed to the appearances of spin-resolved Fano resonances in the linear conductance spectrum resulting from the quantum interference effects between the localized states and the expanded states. The spin-dependent Seebeck effect is obviously enhanced near these Fano resonances with the same spin index; meanwhile, the Seebeck effect of the other spin component has a smaller value due to the smooth changing of the linear conductance with the spin index. Thus, a large spin Seebeck effect is achieved, and the magnitude of the spin figure of merit can reach 1.2 at T = 25 K. Our results indicate that the FM graphene-carbon-chain junctions can be used to design the high-efficiency thermospin devices.

Authors:

Liu, Yu-Shen; Zhang, Xue; Feng, Jin-Fu ^[1]; Wang, Xue-Feng ^[2]

Jiangsu Laboratory of Advanced Functional Materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500 (China)
Department of Physics, Soochow University, Suzhou 215006 (China)

Publication Date:: 2014-06-16

OSTI Identifier:: 22299902

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARBON; CONNECTORS; EFFICIENCY; ELECTRIC CONTACTS; ELECTRODES; FANO FACTOR; GRAPHENE; INTERFERENCE; NANOSTRUCTURES; RESONANCE; SEEBECK EFFECT; SEMICONDUCTOR JUNCTIONS; SPECTRA; SPIN

Citation Formats


                    Liu, Yu-Shen, Zhang, Xue, Feng, Jin-Fu, and Wang, Xue-Feng. Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4884424.

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                    Liu, Yu-Shen, Zhang, Xue, Feng, Jin-Fu, & Wang, Xue-Feng. Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions.  United States.  https://doi.org/10.1063/1.4884424

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                    Liu, Yu-Shen, Zhang, Xue, Feng, Jin-Fu, and Wang, Xue-Feng. Mon .  
        "Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions".  United States.  https://doi.org/10.1063/1.4884424.

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@article{osti_22299902,

  title        = {Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions},

  author       = {Liu, Yu-Shen and Zhang, Xue and Feng, Jin-Fu and Wang, Xue-Feng},

  abstractNote = {We propose a high-efficiency thermospin device constructed by a carbon atomic chain sandwiched between two ferromagnetic (FM) zigzag graphene nanoribbon electrodes. In the low-temperature regime, the magnitude of the spin figure of merit is nearly equal to that of the corresponding charge figure of merit. This is attributed to the appearances of spin-resolved Fano resonances in the linear conductance spectrum resulting from the quantum interference effects between the localized states and the expanded states. The spin-dependent Seebeck effect is obviously enhanced near these Fano resonances with the same spin index; meanwhile, the Seebeck effect of the other spin component has a smaller value due to the smooth changing of the linear conductance with the spin index. Thus, a large spin Seebeck effect is achieved, and the magnitude of the spin figure of merit can reach 1.2 at T = 25 K. Our results indicate that the FM graphene-carbon-chain junctions can be used to design the high-efficiency thermospin devices.},

  doi          = {10.1063/1.4884424},

  url          = {https://www.osti.gov/biblio/22299902},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  number       = 24,

  volume       = 104,

  place        = {United States},

  year         = {2014},

  month        = {6}

}

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