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The magnetic-field correlation function of the universal conductance fluctuations (UCF) in a laterally confined two-dimensional electron gas is calculated in the high-mobility regime. Boundary scattering induces cancellations of the magnetic flux enclosed by electron trajectories, which leads to an enhanced correlation field. The theory is discussed in relation to a recent observation of UCF in a narrow GaAs-Alₓ{Ga}_{1{{-}}x}$As heterostructure.
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Beenakker et al. (1988) studied this question.
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