There is controversy as to whether a one-dimensional (1D) electron gas can spin polarise in the absence of a magnetic field. Together with a simple model, we present conductance measurements on ultra low-disorder quantum wires supportive of a spin polarisation at B=0. A spin energy gap is indicated by the presence of a feature in the range 0.5 - 0.7 X 2e^2/h in conductance data. Importantly, it appears that the spin gap is not static but a function of the electron density. Data obtained using a bias spectroscopy technique are consistent with the spin gap widening further as the Fermi-level is increased.
@article{arxiv.cond-mat/0202309,
title = {Density dependent spin polarisation in ultra low-disorder quantum wires},
author = {D. J. Reilly and T. M. Buehler and J. L. O'Brien and A. R. Hamilton and A. S. Dzurak and R. G. Clark and B. E. Kane and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:cond-mat/0202309},
year = {2007}
}