When a quantum wire is weakly confined, a conductance plateau appears at e^2/h with decreasing carrier density in zero magnetic field accompanied by a gradual suppression of the 2e^2/h plateau. Applying an in-plane magnetic field B|| does not alter the value of this quantization; however, the e^2/h plateau weakens with increasing B|| up to 9 T, and then strengthens on further increasing B||, which also restores the 2e^2/h plateau. Our results are consistent with spin-incoherent transport in a one-dimensional wire.
@article{arxiv.0807.3568,
title = {Spin-Incoherent Transport in Quantum Wires},
author = {W. K. Hew and K. J. Thomas and M. Pepper and I. Farrer and D. Anderson and G. A. C. Jones and D. A. Ritchie},
journal= {arXiv preprint arXiv:0807.3568},
year = {2008}
}