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Density-Dependent Spin Polarization in Ultra-Low-Disorder Quantum Wires

D. J. Reilly, T. M. Buehler, J. L. O’Brien, A. R. Hamilton, A. S. Dzurak, R. G. Clark, B. E. Kane, L. N. Pfeiffer, and K. W. West
Phys. Rev. Lett. 89, 246801 – Published 20 November 2002
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Abstract

There is controversy as to whether a one-dimensional (1D) electron gas can spin polarize in the absence of a magnetic field. Together with a simple model, we present conductance measurements on ultra-low-disorder quantum wires supportive of a spin polarization at B=0. A spin energy gap is indicated by the presence of a feature in the range (0.50.7)×2e2/h in conductance data. Importantly, it appears that the spin gap is not constant but a function of the electron density. Data obtained using a bias spectroscopy technique are consistent with the spin gap widening further as the Fermi level is increased.

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  • Received 14 March 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.246801

©2002 American Physical Society

Authors & Affiliations

D. J. Reilly1,2,*, T. M. Buehler1,2, J. L. O’Brien1,2, A. R. Hamilton1,2, A. S. Dzurak1,3, R. G. Clark1,2, B. E. Kane, L. N. Pfeiffer4, and K. W. West4

  • 1Centre for Quantum Computer Technology, University of New South Wales, Sydney 2052, Australia
  • 2School of Physics, University of New South Wales, Sydney 2052, Australia
  • 3School of Electrical Engineering & Telecommunications, University of New South Wales, Sydney 2052, Australia
  • 4Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974

  • *Email address: djr@jupiter.phys.unsw.edu.au
  • Present address: Laboratory for Physical Sciences, University of Maryland, College Park, MD 20740.

See Also

A Mesoscopic Mystery

JR Minkel
Phys. Rev. Focus 10, 24 (2002)

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Vol. 89, Iss. 24 — 9 December 2002

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