Many-body physics of intersubband polaritons

TL;DR

This paper develops a many-body theoretical framework to understand how Coulomb interactions and Pauli saturation influence intersubband polaritons, revealing modifications in depolarization shifts and scattering efficiencies.

Contribution

It introduces a microscopic many-body theory for intersubband polaritons in a 2D electron gas, accounting for electron-electron interactions and saturation effects.

Findings

Coulomb interactions modify depolarization shifts.

Saturation effects influence polariton scattering efficiency.

The theory predicts changes in light-matter coupling dynamics.

Abstract

Intersubband polaritons are light-matter excitations originating from the strong coupling between an intersubband quantum well electronic transition and a microcavity photon mode. In this paper we study how the Coulomb electron-electron interaction and the Pauli saturation of the electronic transitions affect the physics of intersubband polaritons. We develop a microscopic many-body theory for the physics of such composite bosonic excitations in a microcavity-embedded two-dimensional electron gas. As a first application, we calculate the modification of the depolarization shifts and the efficiency of intersubband polariton-polariton scattering processes.