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Atomic and electronic properties of quasi-one-dimensional MoS2 nanowires

Published online by Cambridge University Press:  05 December 2012

Lucas Fernandez Seivane*
Affiliation:
Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, Texas 78249-0697
Hector Barron
Affiliation:
Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, Texas 78249-0697
Silvana Botti
Affiliation:
Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA-DSM, 91128 Palaiseau, France; and European Theoretical Spectroscopy Facility (ETSF), 1348 Louvain-la-Neuve, Belgium
Miguel Alexandre Lopes Marques
Affiliation:
LPMCN, Université Claude Bernard Lyon I and CNRS, 69622 Villeurbanne, France; and European Theoretical Spectroscopy Facility (ETSF), 1348 Louvain-la-Neuve, Belgium
Ángel Rubio
Affiliation:
Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, Centro Mixto CSIC-UPV/EHU and Donostia International Physics Center, San Sebastián, Spain
Xóchitl López-Lozano
Affiliation:
Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, Texas 78249-0697
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The structural, electronic, and magnetic properties of quasi-one-dimensional MoS2nanowires (NWs), passivated by extra sulfur, have been determined using ab initio density functional theory. The nanostructures were simulated using several different models based on experimental electron microscopy images and theoretical literature. It is found that independently of the geometrical details and the coverage of extra sulfur at the Mo edge, quasi-one-dimensional metallic states are predominant in all the low-energy model structures despite their reduced dimensionality. These metallic states are localized mainly at the edges. However, the electronic and magnetic character of the NWs does not depend only on the S saturation but also on the symmetry configuration of the S edge atoms. Our results show that for the same S saturation, the magnetization can be decreased by increasing the pairing of the S and Mo edge atoms. In spite of the observed pairing of S dimers at the Mo edge, the NWs do not experience a Peierls-like metal–insulator transition.

Type
Invited Feature Paper
Copyright
Copyright © Materials Research Society 2012

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References

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