The microwave induced resistance response of a high mobility 2DEG from the quasi-classical limit to the quantum Hall regime

TL;DR

This study explores microwave-induced resistance oscillations in a high mobility 2DEG across a broad frequency spectrum, revealing their transition from classical to quantum regimes and identifying the conditions under which they vanish.

Contribution

It provides the first comprehensive experimental analysis of MIROs from the quasi-classical to the quantum Hall regime across a wide frequency range.

Findings

MIROs are observed at frequencies up to ~150 GHz with a periodicity linked to microwave and cyclotron frequencies.

MIROs diminish and disappear in the THz range, with resistance changes at cyclotron resonance.

The waveform of MIROs at low frequencies aligns with a simplified theoretical model involving Landau level damping.

Abstract

Microwave induced resistance oscillations (MIROs) were studied experimentally over a very wide range of frequencies ranging from ~20 GHz up to ~4 THz, and from the quasi-classical regime to the quantum Hall effect regime. At low frequencies regular MIROs were observed, with a periodicity determined by the ratio of the microwave to cyclotron frequencies. For frequencies below 150 GHz the magnetic field dependence of MIROs waveform is well described by a simplified version of an existing theoretical model, where the damping is controlled by the width of the Landau levels. In the THz frequency range MIROs vanish and only pronounced resistance changes are observed at the cyclotron resonance. The evolution of MIROs with frequency are presented and discussed.