Magneto-transport controlled by Landau polariton states

TL;DR

This paper demonstrates how Landau polariton states in a cavity-embedded 2D electron gas significantly alter magneto-transport properties, including dc resistivity, even without external light, revealing vacuum-induced effects and the roles of localized and delocalized states.

Contribution

It uncovers the impact of electronic polariton components on magneto-transport in the ultrastrong coupling regime, extending understanding beyond optical properties.

Findings

Cavity coupling modifies dc resistivity without external irradiation.

Vacuum-induced resistivity changes confirmed.

Differentiates roles of localized and delocalized states in photo-assisted transport.

Abstract

Hybrid excitations, called polaritons, emerge in systems with strong light-matter coupling. Usually, they dominate the linear and nonlinear optical properties with applications in quantum optics. Here, we show the crucial role of the electronic component of polaritons in the magneto-transport of a cavity-embedded 2D electron gas in the ultrastrong coupling regime. We show that the linear dc resistivity is significantly modified by the coupling to the cavity even without external irradiation. Our observations confirm recent predictions of vacuum-induced modification of the resistivity. Furthermore, photo-assisted transport in presence of a weak irradiation field at sub-THz frequencies highlights the different roles of localized and delocalized states.