A shoulder-like feature close to (0.7×2e2/h), "the 0.7 structure" at zero magnetic field was observed in clean one-dimensional (1D) channels [K.J. Thomas et al., Phys. Rev. Lett. 77, 135 (1996)]. To provide further understanding of this structure, we have performed low-temperature measurements of a novel design of 1D channel with overlaying finger gates to study the 0.7 structure as a function of lateral confinement strength and potential profile. We found that the structure persists when the lateral confinement strength is changed by a factor of 2. We have also shown that the 0.7 structure present in two 1D channels in series behaves like a single 1D channel which shows the 0.7 structure, demonstrating that the 0.7 structure is not a transmission effect through a ballistic channel at zero in-plane magnetic field.
Cite
@article{arxiv.cond-mat/9907379,
title = {Spin-dependent transport in a clean one-dimensional channel},
author = {C. -T. Liang and M. Y. Simmons and C. G. Smith and G. H. Kim and D. A. Ritchie and M. Pepper},
journal= {arXiv preprint arXiv:cond-mat/9907379},
year = {2009}
}
Comments
4 pages, 7 figures, latex, to be published in Phys. Rev. B