Metal-insulator transition and low-density phases in a strongly-interacting two-dimensional electron system

TL;DR

This paper reviews recent experimental findings on the metal-insulator transition and low-density phases in strongly-interacting two-dimensional electron systems, highlighting the metallic state in ultra-clean SiGe quantum wells and evidence for a flat band and quantum electron solid.

Contribution

It provides a comprehensive review of experimental evidence for novel phases and transitions in low-disorder 2D electron systems, emphasizing recent advances in SiGe quantum wells.

Findings

Evidence for a metallic state in ultra-clean SiGe quantum wells

Observation of a flat band at the Fermi level

Indications of a quantum electron solid phase

Abstract

We review recent experimental results on the metal-insulator transition and low-density phases in strongly-interacting, low-disordered Si-based two-dimensional electron systems. Special attention is given to the metallic state in ultra-clean SiGe quantum wells and to the evidence for a flat band at the Fermi level and a quantum electron solid.