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, AR Hamilton, JL O'Brien, N.E. Lumpkin

Research output: Contribution to journalArticle (Academic Journal)peer-review

152 Citations (Scopus)

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
Translated title of the contributionMany-body spin-related phenomena in ultra low-disorder quantum wires
Original languageEnglish
Pages (from-to)121311/1 - 121311/4
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume63 (12)
DOIs
Publication statusPublished - Mar 2001

Bibliographical note

Publisher: American Physical Society

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