T. -M. Chen, M. Pepper, I. Farrer, G. A. C. Jones, D. A. Ritchie
There is considerable interest in being able to control the spin dynamics, particularly in mesoscopic and nanoscale semiconductor devices as this could lead to the development of a range of electronic functions not presently available. In order to develop successfully such concepts it is necessary to controllably generate, manipulate, and detect spin currents by electrical means and so minimize, or eliminate, the use of ferromagnetic contacts or external magnetic fields. Here we demonstrate on-chip spin polarizing/filtering actions by driving the gate-defined one dimensional (1D) conductor, one of the simplest geometries for integrated quantum devices, away from the conventional Ohmic regime. Direct measurement of the spin polarization of emitted current was performed when the momentum degeneracy was lifted, wherein both the 1D polarizer for spin injection and the analyser for spin detection were demonstrated. The results showed that a configuration of gates and applied voltages can give rise to a tunable spin pumping efficiency, which has implications for the development of spintronic devices and future quantum information processing.
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http://arxiv.org/abs/1202.5606
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