Transport through a band insulator with Rashba spin-orbit coupling: metal-insulator transition and spin-filtering effects

Details Transport through a band insulator with Rashba spin-orbit coupling: metal-insulator transition and spin-filtering effects Transport through a band insulator with Rashba spin-orbit coupling: metal-insulator transition and spin-filtering effects

2009-05-05

arxiv.org/abs/0905.0611v1

Physical Review B 81 (2010) 165443

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.81.165443

We calculate the current-voltage characteristic of a one-dimensional band insulator with magnetic field and Rashba spin-orbit coupling which is connected to nonmagnetic leads. Without spin-orbit coupling we find a complete spin-filtering effect, meaning that the electric transport occurs in one spin channel only. For a large magnetic field which closes the band gap, we show that spin-orbit coupling leads to a transition from metallic to insulating behavior. The oscillations of the different spin-components of the current with the length of the transport channel are studied as well.

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