Metallic behaviour in SOI quantum wells with strong intervalley scattering

TL;DR

This paper demonstrates that metallic behavior persists in silicon on insulator quantum wells even with strong intervalley scattering, highlighting the significant role of electron interactions in such systems.

Contribution

It reveals that strong intervalley scattering does not suppress metallic behavior in SOI quantum wells, emphasizing the importance of electron interactions.

Findings

Metallic behavior observed despite strong intervalley scattering.

Interactions are stronger in SOI than in conventional MOSFETs.

Intervalley scattering does not eliminate metallic conductivity.

Abstract

The fundamental properties of valleys are recently attracting growing attention due to electrons in new and topical materials possessing this degree-of-freedom and recent proposals for val-leytronics devices. In silicon MOSFETs, the interest has a longer history since the valley degree of freedom had been identified as a key parameter in the observation of the controversial "metallic behaviour" in two dimensions. However, while it has been recently demonstrated that lifting valley degeneracy can destroy the metallic behaviour, little is known about the role of intervalley scattering. Here, we show that the metallic behaviour can be observed in the presence of strong interval-ley scattering in silicon on insulator (SOI) quantum wells. Analysis of the conductivity in terms of quantum corrections reveals that interactions are much stronger in SOI than in conventional MOSFETs, leading to the metallic behaviour despite the strong intervalley scattering. The prospect of manipulating the valley degree of freedom in materials like AlAs, 1 silicon 2--4 graphene,