Floquet scattering theory of negative magneto-conductance of 2DEG under microwave radiation

TL;DR

This paper develops a Floquet scattering theory to analyze the magneto-transport properties of a 2D electron gas under microwave radiation, revealing conditions for negative conductance and the effects of bias and microwave frequency.

Contribution

It introduces a non-perturbative Floquet scattering approach to study microwave-induced negative conductance in 2DEG systems with finite bias.

Findings

Negative dc conductance occurs under sufficient microwave power.

Increasing dc bias restores positive conductance.

Microwave frequency influences the non-equilibrium distribution function.

Abstract

We develop a theory of magneto-transport properties of two-dimensional electron gas in cylindrical geometry where finite bias and microwave are locally applied. By invesitgating the Landauer conductance based on Floquet theory, we obtain the conductance without perturbation analysis. We show that the dc conductance becomes negative when dc electric field is applied inside the 2DEG with sufficient microwave power. A positive sign of the current is restored by increasing dc bias. We analyze the radiation induced non-equilibrium distribution function with respect to the frequency of the applied microwave.