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Computational study of spin caloritronics in a pristine and defective antimonene nanoribbon

Hashemi, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physe.2020.114083
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. In this paper, by using first-principle density functional theory (DFT) combined with non-equilibrium Green's function (NEGF), thermally induced spin current in zigzag and armchair Antimonene Nanoribbon (SbNR) is investigated. Also, we obtain higher spin current in Armchair nanoribbon (ANR) than zigzag nanoribbon (ZNR), because the start energy of transmission for ANR is closer to the Fermi level than ZNR. The results show that the device has a perfect spin Seebeck effect under temperature difference without gate voltage or bias voltage. For the ANR configuration, the competition between spin up holes and spin down electrons leads to negative differential behavior of charge current, which is essential for the design of thermal transistors. We also investigate the effect of a single vacancy and double vacancy on the structural and electronic properties of ZNR and ANR. The results show that vacancy in ZNR leads to a decrease in spin currents, whereas in ANR, spin currents increase. Double vacancy in ANR can significantly enhance spin up current up to about 2.5 times the pristine one. The results verify the Armchair Nanoribbon as a promising candidate for spin caloritronics devices, which can be used in future low power consumption technology. © 2020
  6. Keywords:
  7. A vacancy ; Antimonene ; Negative differential behavior ; Spin caloritronics ; Spintronics ; Computation theory ; Design for testability ; Electronic properties ; Nanoribbons ; Antimonene ; Computational studies ; First-principle density-functional theories ; Non-equilibrium Green's function ; Structural and electronic properties ; Temperature differences ; Density functional theory
  8. Source: Physica E: Low-Dimensional Systems and Nanostructures ; Volume 120 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1386947719318521