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''
@article{arxiv.cond-mat/0509448,
title = {Spontaneous spin polarization in quantum point contacts},
author = {L. P. Rokhinson and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:cond-mat/0509448},
year = {2009}
}
Comments
revised discussion and data analysis, accepted to PRL