Detecting Spin-Polarized Currents in Ballistic Nanostructures
Mesoscale and Nanoscale Physics
2009-11-07 v1
Abstract
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.
Cite
@article{arxiv.cond-mat/0206379,
title = {Detecting Spin-Polarized Currents in Ballistic Nanostructures},
author = {R. M. Potok and J. A. Folk and C. M. Marcus and V. Umansky},
journal= {arXiv preprint arXiv:cond-mat/0206379},
year = {2009}
}
Comments
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