Abstract
We report the first experimental study, in the quasiballistic regime, of magnetic field correlation properties of quantum-resistance fluctuations, between phase coherent spatial regions. Our devices are GaAs-${\mathrm{Al}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As quasi-one-dimensional wires with an elastic-scattering length comparable to the voltage probe spacing and at most 10 transverse channels occupied. We find the correlation coefficients to be substantially different than recent results in diffusive wires (\ensuremath{\sim}0 compared to -0.5 for the latter), indicating that the universality, which characterizes fluctuations in diffusive quantum transport, is beginning to break down in this few-channel, ballistic limit.
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