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We present results on the transverse magnetoconductance in the range 0. 3 to 8 T of a narrow, variable-width channel in a GaAs: AlGaAs heterojunction. As the width of the channel is decreased below 0. 25 the structure in the magnetoconductance changes from Shubnikov-de Haas oscillations to the magnetic depopulation of one-dimensional subbands. A semiclassical WKB calculation is presented which gives good agreement with experiment.
Berggren et al. (Mon,) studied this question.
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