Abstract
We have investigated mesoscopic conductance fluctuations in a GaAs quantum well with five electrically quantised two-dimensional (2D) subbands occupied. The conductance fluctuations occur even in a magnetic field parallel to the plane. We attribute the fluctuations to rapid electron-impurity scattering between different 2D subbands which leads to quasi-3d motion of electrons within the quantum well. We also report for the first time, the angular correlation of the fluctuations as the magnetic field is rotated.
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