Many-body spin-related phenomena in ultra low-disorder quantum wires

D. J. Reilly, G. R. Facer, A. S. Dzurak, B. E. Kane, R. G. Clark, P. J. Stiles, A. R. Hamilton, J. L. O’Brien, N. E. Lumpkin, L. N. Pfeiffer, K. W. West

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Abstract

Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e2/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder GaAs/AlxGa1−xAs quantum wires with nominal lengths l = 0, 0.5, and 2 μm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near 0.7 × 2e2/h for l = 0, whereas the l = 2 μm wires show structure evolving with increasing electron density to 0.5 × 2e2/h, the value expected for an ideal spin-split subband. For intermediate lengths (l = 0.5 μm) the feature at 0.7 × 2e2/h evolves to 0.55 × 2e2/h with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number12
DOIs
Publication statusPublished - 13 Mar 2001
Externally publishedYes

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