Detection of spin polarization in quantum point contacts
Date of this VersionApril 2008
J. Phys.: Condens. Matter 20 (2008) 164212
This document has been peer-reviewed.
We use spatial spin separation by a magnetic focusing technique to probe the polarization of quantum point contacts. The point contacts are fabricated from p-type GaAs/AlGaAs heterostructures. A finite polarization is measured in the low density regime, when the conductance of a point contact is tuned to < 2e(2)/h. Polarization is stronger in samples with a well defined '0.7 structure'.