Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-07-24
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 7 figures, latex, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.10687
A shoulder-like feature close to $(0.7\times 2e^{2}/h)$, "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.
Kim Han Geun
Pepper Michael
Ritchie Dave A.
Simmons Michelle Y.
Smith Christopher G.
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