Oscillations of magnetoresistance of 2DEG in a weak magnetic field under microwave irradiation

TL;DR

This paper investigates microwave-induced oscillations in the magnetoresistance of 2D electron gases, proposing a new explanation based on the Boltzmann kinetic equation for observed beat-like behaviors in weak magnetic fields.

Contribution

It introduces an alternative explanation for beat-like oscillations in magnetoresistance, avoiding reliance on spin-orbit interaction theories.

Findings

Oscillations appear where SdH oscillations are suppressed.

Beat-like behavior observed in weak magnetic fields.

Proposed explanation based on Boltzmann kinetic equation.

Abstract

Under microwave irradiation, in 2D electron systems with high filling factors oscillations of longitudinal magnetoresistance appear in the range of magnetic fields where ordinary SdH oscillations are suppressed. An unusual beat-like behaviour of these oscillations in weak magnetic fields (B < 0.02 T) was attributed to the zero spin splitting previously. We propose an alternate explanation of this beat-like structure on the basis of the Boltzmann kinetic equation, without any reference to the spin-orbit interaction.