Current instability and single-mode THz generation in ungated two-dimensional electron gas

TL;DR

This paper investigates current instability in ungated 2D electron layers and demonstrates the potential for a single-mode terahertz generator operating at THz frequencies.

Contribution

It provides a theoretical analysis of current instability and proposes a new single-mode THz generation mechanism in ungated 2D electron systems.

Findings

Current instability can be induced in ungated 2D electron layers.

Single-mode operation in the terahertz range is feasible.

The analysis applies to arbitrary current and scattering conditions.

Abstract

We analyze the current instability of the steady state with a direct current for an ungated two-dimensional(2D) electron layer for arbitrary current and the carrier scattering strength. We demonstrate the possibility of single-mode generator operating in terahertz frequency range.