Abstract
Spin-polarized transport through a carbon nanotube quantum dot in the Kondo regime is studied by the equation of motion method. Magnetic field perpendicular to the tube axis breaks the spin degeneracy, whereas axial field breaks both the orbital and spin degeneracies. A strong magnetic field anisotropy of conductance and anisotropy of its spin polarization is observed. We propose a new spin filtering mechanism for the nanotubes with the orbitally nondegenerate levels based on the field induced tuning of spin-polarized states from the same shell into orbital degeneracy.
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