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

TL;DR

This paper develops a theory for magneto-oscillations in photoconductivity of multisubband 2D electron systems, highlighting how Coulomb interactions and internal electric fields influence oscillation amplitude and positions, especially in electron systems on liquid helium.

Contribution

It introduces a comprehensive model accounting for Coulomb interactions and internal electric fields affecting magneto-oscillations in multisubband 2D electron systems.

Findings

Coulomb interactions suppress oscillation amplitude.

Internal electric fields alter magnetoconductivity minima.

High radiation power leads to zero-resistance states.

Abstract

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