Physical Review Letters 96,15 (2006) 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."
dimensional electron-gas;; atomic-force microscope;; quantized conductance;; nanostructures;; transport;; oxidation
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