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Spin transport in the two-dimensional quantum disordered anisotropic Heisenberg model

Lima, L.S. ; Pires, A.S.T. ; Costa, B.V.

Journal of magnetism and magnetic materials, 2014-12, Vol.371, p.89-93 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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Título:
Spin transport in the two-dimensional quantum disordered anisotropic Heisenberg model
Autor: Lima, L.S. ; Pires, A.S.T. ; Costa, B.V.
Assuntos: Anisotropy ; Asymptotic properties ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Diluted model ; Dilution ; Electronic transport in condensed matter ; Exact sciences and technology ; General formulation of transport theory ; Mathematical models ; Percolation ; Physics ; Spin transport ; Theory of electronic transport; scattering mechanisms ; Thresholds ; Transport ; Two dimensional
É parte de: Journal of magnetism and magnetic materials, 2014-12, Vol.371, p.89-93
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: We use the self consistent harmonic approximation together with the Linear Response Theory to study the effect of nonmagnetic disorder on spin transport in the quantum diluted two-dimensional anisotropic Heisenberg model with spin S=1 in a square lattice. The model has a BKT transition at zero dilution. We calculate the regular part of the spin conductivity σreg(ω) and the Drude weight DS(T) as a function of the non-magnetic concentration, x. Our calculations show that the spin conductivity drops abruptly to zero at xcSCHA≈0.5 indicating that the system changes from an ideal spin conductor state to an insulator. This value is far above the site percolation threshold xcsite≈0.41. Although the SCHA fails in determining precisely the percolation threshold, both the spin conductivity and the Drude weight show a quite regular behavior inside 0≤x≤xcSCHA indicating that the transition stays in the same universality class all along the interval. •The site dilution generates a large influence on regular part of the spin conductivity, σreg(ω), and in the Drude weight, D(T).•In a concentration of impurities about x≈0.5, the regular part of the spin conductivity and the Drude weight fall to zero.•In this point we have a change in the state of the system from an ideal spin conductor to a spin insulator.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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Spin transport in the two-dimensional quantum disordered anisotropic Heisenberg model

Lima, L.S. ; Pires, A.S.T. ; Costa, B.V.

Amsterdam: Elsevier B.V

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