The low-temperature(4.2<T<12.5 K) magnetotransport (B<2 T) of
two-dimensional electrons occupying two subbands (with energy E1β and E2β)
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
Ξ12β=(E2ββE1β)=kβ βΟcβ, where Ξ12β is the
subband energy separation, Οcβ 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.Comment: 6 pages, 4 figure