Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction

Details Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction

2007-09-03

arxiv.org/abs/0709.0203v1

Phys. Rev. B 76, 195304 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.76.195304

We investigate the enhancement of spin polarization in a quantum wire in the presence of a constriction and a spin-orbit coupling segment. It is shown that the spin-filtering effect is significantly heightened in comparison with the configuration without the constriction. It is understood in the studies that the constriction structure plays a critical role in enhancing the spin filtering by means of confining the incident electrons to occupy one channel only while the outgoing electrons occupy two channels. The enhancement of spin-filtering has also been analyzed within the perturbation theory. Because the spin polarization arises mainly from the scattering between the constriction and the segment with spin-orbit coupling, the sub-band mixing induced by spin-orbit interaction in the scattering process and the interferences result in higher spin-filtering effect.

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