Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems

TL;DR

This paper investigates how multiphoton processes and virtual photon effects influence radiation-induced magnetoresistance oscillations in 2D electron systems, explaining new structures and zero-resistance states observed under microwave radiation.

Contribution

It provides a detailed analysis linking multiphoton and virtual photon processes to observed magnetoresistance phenomena, expanding understanding of radiation effects in 2D electron systems.

Findings

Multiphoton assisted processes explain new resistance structures.

Virtual photon effects cause suppression of average resistance.

Reproduces resistance dropping and peak narrowing observed experimentally.

Abstract

Recently discovered new structures and zero-resistance states outside the well-known oscillations are demonstrated to arise from multiphoton assisted processes, by a detailed analysis of microwave photoresistance in two-dimensional electron systems under enhanced radiation. The concomitant resistance dropping and peak narrowing observed in the experiments are also reproduced. We show that the radiation-induced suppression of average resistance comes from virtual photon effect and exists throughout the whole magnetic field range.