Spin properties of low-density one-dimensional wires

2000/05/03 by K. J. Thomas, J. T. Nicholls, M. Pepper +3 · 6 citations
Materials Science · Physics and Astronomy · #Graphene research and applications #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.61.r13365

5 pages, 4 fugures, to appear in Phys. Rev. B (Rapid) 15 May 2000 issue

arxiv created 2000/05/03 · openalex publication_date 2000/05/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report conductance measurements of a ballistic one-dimensional (1D) wire defined in the lower two-dimensional electron gas of a GaAs/Al_xGa_1\ensuremath-xAs double quantum well. At low temperatures there is an additional structure at 0.7(2e²/h) in the conductance, which tends to e²/h as the electron density is decreased. We find evidence for complete spin polarization in a weakly disorderd 1D wire at zero magnetic field through the observation of a conductance plateau at e²/h, which strengthens in an in-plane magnetic field and disappears with increasing electron density. In all cases studied, with increasing temperature structure occurs at 0.6(2e²/h). We suggest that the 0.7 structure is a many-body spin state excited out of, either the spin-polarized electron gas at low densities, or the spin-degenerate electron gas at high densities.

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