Spontaneous spin polarization in quantum point contacts

Details Spontaneous spin polarization in quantum point contacts Spontaneous spin polarization in quantum point contacts

2005-09-16

arxiv.org/abs/cond-mat/0509448v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

revised discussion and data analysis, accepted to PRL

Scientific paper

10.1103/PhysRevLett.96.156602

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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