We describe the transport properties of a 5 μm long one-dimensional (1D) quantum wire. Reduction of conductance plateaux due to the introduction of weakly disorder scattering are observed. In an in-plane magnetic field, we observe spin-splitting of the reduced conductance steps. Our experimental results provide evidence that deviation from conductance quantisation is very small for electrons with spin parallel and is about 1/3 for electrons with spin anti-parallel. Moreover, in a high in-plane magnetic field, a spin-polarised 1D channel shows a plateau-like structure close to 0.3×e2/h which strengthens with {\em increasing} temperatures. It is suggested that these results arise from the combination of disorder and the electron-electron interactions in the 1D electron gas.
@article{arxiv.cond-mat/9912349,
title = {Spin-dependent transport in a quasiballistic quantum wire},
author = {C. -T. Liang and M. Pepper and M. Y. Simmons and C. G. Smith and D. A. Ritchie},
journal= {arXiv preprint arXiv:cond-mat/9912349},
year = {2009}
}
Comments
4 pages, 5 figures, latex to be published in Phys. Rev. B (15/3/2000)