Commensurability oscillations and positive magnetoresistance in two-subband quasi-two-dimensional electron system with periodic lateral modulation
Bykov A. A. 1, Nomokonov D. V. 1, Strygin I. S. 1, Marchishin I. V. 1, Rodyakina E. E. 1
1Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Email: nomokonov@isp.nsc.ru
Two-subband magnetotransport of quasi-two-dimensional electron gas in a single quantum well with periodic lateral modulation of electrostatic potential has been studied. In the system under study except Shubnikov-de Haas oscillations, magnetointersubband oscillations and positive magnetoresistance additionally the two series of commensurability oscillations have been observed. Frequencies of this oscillations correspond to commensurability oscillations in two filled subbands of dimensional quantization. Combined analysis of these two series of commensurability oscillations and positive magnetoresistance gives possibility to define mobilities and values of 1D periodic potential modulation for each subband. Keywords: two-subband electron system, 1D potential modulation, commensurability oscillations of magnetoresistance.
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