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A Gate-Controlled Bidirectional Spin Filter Using Quantum Coherence

J. A. Folk, R. M. Potok, C. M. Marcus and V. Umansky
Science
New Series, Vol. 299, No. 5607 (Jan. 31, 2003), pp. 679-682
Stable URL: http://www.jstor.org/stable/3833435
Page Count: 4
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Abstract

We demonstrate a quantum coherent electron spin filter by directly measuring the spin polarization of emitted current. The spin filter consists of an open quantum dot in an in-plane magnetic field; the in-plane field gives the two spin directions different Fermi wavelengths resulting in spin-dependent quantum interference of transport through the device. The gate voltage is used to select the preferentially transmitted spin, thus setting the polarity of the filter. This provides a fully electrical method for the creation and detection of spin-polarized currents. Polarizations of emitted current as high as 70% for both spin directions (either aligned or anti-aligned with the external field) are observed.

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