Density-dependent spin polarization in ultra-low-disorder quantum wires |
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Authors: | Reilly D J Buehler T M O'Brien J L Hamilton A R Dzurak A S Clark R G Kane B E Pfeiffer L N West K W |
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Institution: | Centre for Quantum Computer Technology, University of New South Wales, Sydney 2052, Australia. djr@jupiter.phys.unsw.edu.au |
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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 (0.5-0.7)x2e(2)/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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