Coulombic effects on magnetoconductivity oscillations induced by microwave excitation in multisubband two-dimensional electron systems

摘要

We develop a theory of magneto–oscillations in photoconductivity of multisubband two-dimensional electronudsystems which takes into account strong Coulomb interaction between electrons. In the presence of a magneticudfield oriented perpendicular, internal electric fields of fluctuational origin cause fast drift velocities of electronudorbit centers which affect probabilities of inter-subband scattering and the photoconductivity. For the electronudsystem formed on the liquid helium surface, internal forces are shown to suppress the amplitude of magnetooscillations,udand change positions of magnetoconductivity minima which evolve in zero-resistance states for highudradiation power.