Spin-selective strong light-matter coupling in a 2D hole gas-microcavity system

TL;DR

This paper demonstrates spin-selective strong light-matter coupling in a 2D hole gas within a microcavity, controlled by magnetic field and hole density, enabling new manipulation of spin in polaritonic systems.

Contribution

It introduces a method to achieve polarization-dependent strong coupling in a 2D gas, advancing control over spin in light-matter interactions.

Findings

Circular-polarization dependence of vacuum Rabi splitting observed.

Quantitative model of Landau level transitions coupling to microcavity developed.

Control over spin degree of freedom demonstrated in polaritonic systems.

Abstract

The interplay between time-reversal symmetry breaking and strong light-matter coupling in 2D gases brings intriguing aspects to polariton physics. This combination can lead to polarization/spin selective light-matter interaction in the strong coupling regime. In this work, we report such a selective strong light-matter interaction by harnessing a 2D gas in the quantum Hall regime coupled to a microcavity. Specifically, we demonstrate circular-polarization dependence of the vacuum Rabi splitting, as a function of magnetic field and hole density. We provide a quantitative understanding of the phenomenon by modeling the coupling of optical transitions between Landau levels to the microcavity. This method introduces a control tool over the spin degree of freedom in polaritonic semiconductor systems, paving the way for new experimental possibilities in light-matter hybrids.