Detection of spin polarization in quantum point contacts

Leonid P. Rokhinson, Birck Nanotechnology Center, Purdue University
Loren N. Pfeiffer, Lucent Technologies, Bell Labs
Kenw W. West, Lucent Technologies, Bell Labs

Date of this Version

April 2008

Citation

J. Phys.: Condens. Matter 20 (2008) 164212

This document has been peer-reviewed.

 

Abstract

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'.

 

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