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.
@article{arxiv.cond-mat/9606004,
title = {Possible Spin Polarization in a One-Dimensional Electron Gas},
author = {K. J. Thomas and J. T. Nicholls and M. Y. Simmons and M. Pepper and D. R. Mace and D. A. Ritchie},
journal= {arXiv preprint arXiv:cond-mat/9606004},
year = {2009}
}
Comments
Ten pages with four ps figures. Accepted for publication in Phys. Rev. Lett. (17. June 1996)