Spin properties of low-density one-dimensional wires
Spin properties of low-density one-dimensional wires
We report conductance measurements of a ballistic one-dimensional (1D) wire defined in the lower two-dimensional electron gas of a ${\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}/\mathrm{A}\mathrm{l}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ double quantum well. At low temperatures there is an additional structure at ${0.7(2e}^{2}/h)$ in the conductance, which tends to ${e}^{2}/h$ as the electron density is decreased. We find evidence for …