Abstract
Low-temperature electron magnetotransport in single GaAs quantum wells with two populated subbands is studied at large filling factors. Magneto-intersubband (MIS) and acoustic-phonon-induced oscillations of dissipative resistance are found to be coexisting but interfering substantially with each other. The experiments show that amplitude of the MIS oscillations enhances significantly by phonons, indicating ``constructive interference'' between the electron-phonon scattering and the intersubband electron transitions. Temperature damping of the quantum oscillations is found to be related to broadening of Landau levels caused by considerable electron-electron scattering.
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