Multi-terminal spin-dependent transport in ballistic carbon nanotubes

Details Multi-terminal spin-dependent transport in ballistic carbon nanotubes Multi-terminal spin-dependent transport in ballistic carbon nanotubes

2009-03-23

arxiv.org/abs/0903.3813v1

Phys. Rev. B 79, 125422 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 8 figures

Scientific paper

10.1103/PhysRevB.79.125422

We study theoretically nonlocal spin transport in a ballistic carbon nanotube contacted to two ferromagnetic leads and two normal-metal leads. When the magnetizations of the two ferromagnets are changed from a parallel to an antiparallel configuration, the circuit shows a hysteretic behavior which is specific to the few-channel regime. In the coherent limit, the amplitude of the magnetic signals is strongly enhanced due to resonance effects occurring inside the nanotube. Our calculations pave the way for experiments on low-dimensional nonlocal spin transport, which should give results remarkably different from the experiments realized so far in the multichannel diffusive incoherent regime.

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