Detecting Spin-Polarized Currents in Ballistic Nanostructures

Details Detecting Spin-Polarized Currents in Ballistic Nanostructures Detecting Spin-Polarized Currents in Ballistic Nanostructures

2002-06-19

arxiv.org/abs/cond-mat/0206379v1

Phys. Rev. Lett. 89, 266602 (2002).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.89.266602

We demonstrate a mesoscopic spin polarizer/analyzer system that allows the spin polarization of current from a quantum point contact in an in-plane magnetic field to be measured. A transverse focusing geometry is used to couple current from an emitter point contact into a collector point contact. At large in-plane fields, with the point contacts biased to transmit only a single spin (g < e^2/h), the voltage across the collector depends on the spin polarization of the current incident on it. Spin polarizations of greater than 80% are found for both emitter and collector at 300mK and 7T in-plane field.

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