Effect of electron-electron scattering on magnetointersubband resistance oscillations of two-dimensional electrons in GaAs quantum wells

The low-temperature (4.2 < T < 12.5 K) magnetotransport (B < 2 T) of two-dimensional electrons occupying two subbands (with energy E(1) and E(2)) is investigated in GaAs single quantum well with AlAs/GaAs superlattice barriers. Two series of Shubnikov-de Haas oscillations are found to be accompanied by magnetointersubband (MIS) oscillations, periodic in the inverse magnetic field. The period of the MIS oscillations obeys condition Delta(12)=(E(2)-E(1))=k center dot h omega(c), where Delta(12) is the subband energy separation, omega(c) is the cyclotron frequency, and k is the positive integer. At T=4.2 K the oscillations manifest themselves up to k=100. Strong temperature suppression of the magnetointersubband oscillations is observed. We show that the suppression is a result of electron-electron scattering. Our results are in good agreement with recent experiments, indicating that the sensitivity to electron-electron interaction is the fundamental property of magnetoresistance oscillations, originating from the second-order Dingle factor.