1996/06/03 by K. J. Thomas, J. T. Nicholls, M. Y. Simmons +3 · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevlett.77.135
Ten pages with four ps figures. Accepted for publication in Phys. Rev. Lett. (17. June 1996)
arxiv created 1996/06/03 · arxiv updated 2009/11/30
In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show twenty-six quantized ballistic plateaux, as well as a structure close to 0.7(2e2/h). In an in-plane magnetic field all the 1D subbands show 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.