Density dependent spin polarisation in ultra low-disorder quantum wires

Abstract

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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References in corpus (12)

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• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Interaction Effects in a One-Dimensional Constriction
• Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
• Large-q asymptotics of the random bond Potts model
• Many-body spin related phenomena in ultra-low-disorder quantum wires
• Ferromagnetic correlations in quasi-one-dimensional conducting channels
• Spin-Polarization transition in the two dimensional electron gas
• Conductance anomalies in a one-dimensional quantum contact
• Possible mechanism of the fractional conductance quantization in a one-dimensional constriction
• Spin-dependent transport in a clean one-dimensional channel
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