Novel Phenomena in Dilute Electron Systems in Two Dimensions

TL;DR

This paper reviews recent experimental evidence for a transition to a conducting phase in two-dimensional dilute electron systems at low densities, highlighting the unresolved nature of this phenomenon and its significance for condensed matter physics.

Contribution

It summarizes recent experimental findings on 2D electron systems and discusses the ongoing debate about the nature of the conducting phase.

Findings

Evidence for a transition to a conducting phase at low densities

Uncertainty about the nature of the conducting phase

Intense current theoretical and experimental interest

Abstract

We review recent experiments that provide evidence for a transition to a conducting phase in two dimensions at very low electron densities. The nature of this phase is not understood, and is currently the focus of intense theoretical and experimental attention.