Spin transport in interacting quantum wires and carbon nanotubes

Details Spin transport in interacting quantum wires and carbon nanotubes Spin transport in interacting quantum wires and carbon nanotubes

2000-03-03

arxiv.org/abs/cond-mat/0003038v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.85.3464

We present a general formulation of spin-dependent transport through a clean one-dimensional interacting quantum wire or carbon nanotube, connected to non-collinear ferromagnets via tunnel junctions. We show that the low energy description of each junction is given by a conformally-invariant boundary condition representing *exchange coupling*, in addition to a pair of electron tunneling operators. The effects of the exchange coupling are strongly enhanced by interactions, leading to a dramatic suppression of spin accumulation. This is a direct signature of spin-charge separation in a Luttinger liquid. Furthermore, we demonstrate that magnetic polarization can lead to oscillations in the non-linear current-voltage relation. This phenomena is a surprising purely nonequilibrium effect due to backscattering interactions, which are thus dangerously marginally irrelevant in the repulsively-interacting Luttinger liquid.

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