Density dependent spin polarisation in ultra low-disorder quantum wires

Details Density dependent spin polarisation in ultra low-disorder quantum wires Density dependent spin polarisation in ultra low-disorder quantum wires

2002-02-19

arxiv.org/abs/cond-mat/0202309v1

Phys. Rev. Lett. 89, 246801 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

5 Pages 4 Figures email:djr@jupiter.phys.unsw.edu.au

Scientific paper

10.1103/PhysRevLett.89.246801

There is controversy as to whether a one-dimensional (1D) electron gas can spin polarise 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 polarisation at B=0. A spin energy gap is indicated by the presence of a feature in the range 0.5 - 0.7 X 2e^2/h in conductance data. Importantly, it appears that the spin gap is not static 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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