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Title: Quantum spin transport through magnetic superatom dimer (Cs{sub 8}V-Cs{sub 8}V)

Abstract

Theoretical studies of the spin transport through a magnetic superatom dimer (Cs{sub 8}V)-(Cs{sub 8}V) have been carried out within a density functional theory combined with nonequilibrium Green's-function formalism. It is shown that the electronic transport is sensitive to the binding site as well as the contact distance between the dimer and the electrode, and that the conductance at zero bias exhibits an oscillatory behavior as a function of the contact distance. The conductance in ferromagnetic state shows an unusually high spin polarization that exceeds 80% at large separations. The I-V curve shows negative differential resistance for specific contact distances, whose origin lies in the shift of frontier energy levels as well as the charged state of the superatom, under external bias.

Authors:
 [1];  [2];  [1]
  1. Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284 (United States)
  2. (China)
Publication Date:
OSTI Identifier:
22099067
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 137; Journal Issue: 16; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CESIUM ALLOYS; DENSITY FUNCTIONAL METHOD; DIMERS; GREEN FUNCTION; SPIN; SPIN ORIENTATION; VANADIUM ALLOYS

Citation Formats

Zhu Lin, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, and Khanna, Shiv N. Quantum spin transport through magnetic superatom dimer (Cs{sub 8}V-Cs{sub 8}V). United States: N. p., 2012. Web. doi:10.1063/1.4763461.
Zhu Lin, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, & Khanna, Shiv N. Quantum spin transport through magnetic superatom dimer (Cs{sub 8}V-Cs{sub 8}V). United States. doi:10.1063/1.4763461.
Zhu Lin, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, and Khanna, Shiv N. Sun . "Quantum spin transport through magnetic superatom dimer (Cs{sub 8}V-Cs{sub 8}V)". United States. doi:10.1063/1.4763461.
@article{osti_22099067,
title = {Quantum spin transport through magnetic superatom dimer (Cs{sub 8}V-Cs{sub 8}V)},
author = {Zhu Lin and School of Physics, Huazhong University of Science and Technology, Wuhan 430074 and Khanna, Shiv N.},
abstractNote = {Theoretical studies of the spin transport through a magnetic superatom dimer (Cs{sub 8}V)-(Cs{sub 8}V) have been carried out within a density functional theory combined with nonequilibrium Green's-function formalism. It is shown that the electronic transport is sensitive to the binding site as well as the contact distance between the dimer and the electrode, and that the conductance at zero bias exhibits an oscillatory behavior as a function of the contact distance. The conductance in ferromagnetic state shows an unusually high spin polarization that exceeds 80% at large separations. The I-V curve shows negative differential resistance for specific contact distances, whose origin lies in the shift of frontier energy levels as well as the charged state of the superatom, under external bias.},
doi = {10.1063/1.4763461},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 16,
volume = 137,
place = {United States},
year = {2012},
month = {10}
}