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Experimental study demonstrates novel magnetoresistance oscillations in gated AlGaAs/GaAs heterojunctions, indicating the formation of Landau bands under periodic potential modulation.
We investigate the magnetoresistance of a quasi-two-dimensional electron system subject to a one-dimensional superlattice potential created by field effect in gated AlGaAs/GaAs heterojunctions. At low temperatures this potential gives rise to a new type of magneto-resistance oscillations with a period governed by the ratio of the classical cyclotron diameter 2Rc to the superlattice period a. The oscillations are quantitatively explained in period, phase, and magnitude by the formation of Landau bands in the two-dimensional electron system under the influence of the periodic potential.
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Winkler et al. (1989) studied this question.
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