Spin polarized current in a junction of zigzag carbon nanotube

Details Spin polarized current in a junction of zigzag carbon nanotube Spin polarized current in a junction of zigzag carbon nanotube

2007-09-11

arxiv.org/abs/0709.1566v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 9 figures

Scientific paper

We investigated spin-resolved electronic transport through a junction composed of a nonmagnetic metal electrode and a zigzag carbon nanotube by means of self-consistent Green's function method in the tight binding approximation and the unrestricted Hartree-Fock approximation. Our results show that the electric current can be spin-polarized if the coupling of the junction is weak. Further calculations on spin-spin correlation and local density of states reveal the existence of magnetic edge states in zigzag carbon nanotubes, which is responsible for the observed spin-polarized current and can be controlled by applying a gate voltage. We also studied the influence of the nearest-neighbor Coulomb interaction and the junction coupling strength on the spin-polarization of the current.

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