Possible Spin Polarization in a One-Dimensional Electron Gas
K. J. Thomas, J. T. Nicholls, M. Y. Simmons, M. Pepper, D. R. Mace, D. A. Ritchie
Abstract
In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show twenty-six quantized ballistic plateaux, as well as a structure close to 0.7(2e2/h). In an in-plane magnetic field all the 1D subbands show Zeeman splitting and in the wide channel limit the g-factor is g = 0.4, close to that of bulk GaAs. For the last subband spin-splitting originates from the structure at 0.7(2e2/h), indicating spin polarization at B=0. The measured enhancement of the g-factor as the subbands are depopulated suggests that the ``0.7 structure'' is induced by electron-electron interactions.
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