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Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities.
Materials (Basel)
February 2019
INFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy.
We employ Green's function method for describing multiband models with magnetic impurities and apply the formalism to the problem of chromium impurities adsorbed onto a carbon nanotube. Density functional theory is used to determine the bandstructure, which is then fit to a tight-binding model to allow for the subsequent Green's function description. Electron⁻electron interactions, electron⁻phonon coupling, and disorder scattering are all taken into account (perturbatively) with a theory that involves a cluster extension of the coherent potential approximation.
View Article and Find Full Text PDFA study of the disordered dilute magnetic semiconductors Zn(1-x)Cr(x)Se and Zn(1-x)Fe(x)Se.
J Phys Condens Matter
November 2009
Department of Physics, Tulane University, New Orleans, LA 70118, USA.
We report on the electronic structure and exchange interactions in the dilute magnetic semiconductors Zn(1-x)Cr(x)Se and Zn(1-x)Fe(x)Se. The exchange energies and densities of states were obtained using the layer Korringa-Kohn-Rostoker method and the coherent potential approximation. We find that the dominant exchange in all cases is the super-exchange mechanism, and it is found to be antiferromagnetic for Zn(1-x)Fe(x)Se at all concentrations.
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