skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

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:
; ;  [1];  [2]
  1. Jiangsu Laboratory of Advanced Functional Materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500 (China)
  2. Department of Physics, Soochow University, Suzhou 215006 (China)
Publication Date:
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.
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
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.
@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}
}