Terahertz-induced resistance oscillations in high mobility two-dimensional electron systems

TL;DR

This paper presents a theoretical study of how terahertz radiation affects magnetoresistance oscillations in high mobility two-dimensional electron systems, revealing interference effects between different oscillation types and their physical origins.

Contribution

It introduces a theoretical framework explaining the interaction between radiation-induced magnetoresistance oscillations and Shubnikov-de Haas oscillations under terahertz radiation.

Findings

Disappearance of SdHO oscillations with zero resistance states

Strong modulation of SdHO oscillations at high radiation power

Interference between RIRO and SdHO explains observed effects

Abstract

We report on a theoretical work on magnetotransport under terahertz radiation with high mobility two-dimensional electron systems. We focus on the interaction between the obtained radiation-induced magnetoresistance oscillations (RIRO) and the Shubnikov-de Haas (SdHO) oscillations. We study two effects experimentally obtained with this radiation. First, the observed disappearance of the SdHO oscillations simultaneously with the vanishing resistance at the zero resistance states region. And secondly the strong modulation of the SdHO oscillations at sufficient terahertz radiation power. We conclude that both effects share the same physical origin, the interference between the average advanced distance by the scattered electron between irradiated Landau states, (RIRO), and the available initial density of states at a certain magnetic field, (SdHO). Thus, from a physical standpoint, what the terahertz experiments and theoretical simulations reveal is, on the one hand, the oscillating nature of the Landau states subjected to radiation and, on the other hand, how they behave in the presence of scattering.