Spontaneous spin polarization in quantum point contacts.
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 < 2e2/h. Polarization is stronger in samples with a well-defined "0.7 structure."
Rokhinson
L P
LP
Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.
Pfeiffer
L N
LN
West
K W
KW