Possible Spin Polarization in a One-Dimensional Electron Gas

K. J. Thomas, J. T. Nicholls, M. Y. Simmons, M. Pepper, D. R. Mace, and D. A. Ritchie
Phys. Rev. Lett. 77, 135 – Published 1 July 1996
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Abstract

In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show up to 26 quantized ballistic plateaus, as well as a structure close to 0.7(2e2/h). In an in-plane magnetic field all the 1D subbands show linear Zeeman splitting, and in the wide channel limit the g factor is g=0.4, close to that of bulk GaAs. For the last subband, spin splitting originates from the structure at 0.7(2e2/h), indicating spin polarization at B=0. The measured enhancement of the g factor as the subbands are depopulated suggests that the “0.7 structure” is induced by electron-electron interactions.

  • Received 4 March 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.135

©1996 American Physical Society

Authors & Affiliations

K. J. Thomas, J. T. Nicholls, M. Y. Simmons, M. Pepper, D. R. Mace, and D. A. Ritchie

  • Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom

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Vol. 77, Iss. 1 — 1 July 1996

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