Abstract
Band-structure effects have been investigated in two-dimensional lateral superlattices, consisting of 3×3, 7×7 and 9×15 cells, which form tuneable arrays of quantum dots. In the quantum Hall regime oscillations in the longitudinal magnetoconductance have been found. The reciprocal period scales with the total number of dots in the array, as expected for an artificial two-dimensional crystal. The order of magnitude of the period is in very good agreement with this description. On the slope between the Hall plateaux a more irregular behaviour of the magnetoconductance has been measured, which can be attributed to the crossing of energy gaps by the Fermi level.
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