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Spin filtering and spin diode devices in quantum wire systems

Shokri, A. A ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physe.2004.12.008
  3. Publisher: 2005
  4. Abstract:
  5. Theoretical studies on the spin-dependent transmission and current-voltage characteristic in a mesoscopic system, which consists of two semi-infinite ferromagnetic (FM) leads (as source and drain) separated by a typical periodic quantum dot (QD) are presented. The calculations are based on the tight-binding model and transfer matrix method, and investigate the magnetoresistance (MR) and the spin polarization within the Landauer-Büttiker formalism. The spin-dependent transport behavior can be controlled via a gate voltage and an applied bias in the ballistic regime. The numerical results are shown for a periodic polymer chain with nonmagnetic (NM) and FM leads, and also, with two FM leads. The first system (NM/QD/FM) acts as a spin-filter device in a special condition also contact as a spin diode device. The application of the predicted results may be useful in designing molecular spin-polarized transistors in the future. © 2005 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Current voltage characteristics ; Diodes ; Electrodes ; Ferromagnetic materials ; Hamiltonians ; Magnetoresistance ; Matrix algebra ; Probability ; Semiconductor quantum dots ; Mesoscopic systems ; Molecular spins ; Spin filters ; Spin-dependent transmission ; Semiconductor quantum wires
  8. Source: Physica E: Low-Dimensional Systems and Nanostructures ; Volume 27, Issue 3 , 2005 , Pages 325-331 ; 13869477 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1386947705000251