Role of interference in MM-wave driven DC transport in two dimensional electron gas

TL;DR

This paper investigates how interference effects between multi-microwave-photon processes influence the dark conductivity in high-mobility two-dimensional electron gases under microwave irradiation, emphasizing the role of quantum interference.

Contribution

It introduces the consideration of constructive interference effects between multi-microwave-photon processes in the context of microwave-driven DC transport in 2D electron gases, extending previous density of states models.

Findings

Interference enhances the dark conductivity in high-mobility samples.

The interference effect diminishes as microwave frequency deviates from cyclotron frequency.

A linear response theory for strong harmonic time-dependent perturbations is developed.

Abstract

In this paper we point out that in addition to the density of states effect proposed in Ref.\cite{durst,anderson} one should consider the effect of constructive interference between the multi-MM-wave-photon processes shown in Fig.2. This process enhances the dark value of the conductivity. When the sample is very pure, i.e., when the transport life time is very long, this interference effect quickly diminishes as the MM-wave frequency deviates from the cyclotron frequency. In this paper we also present the linear response theory in the presence of strong harmonic time-dependent perturbation.