Pseudospin dynamics in multimode polaritonic Josephson junctions

TL;DR

This paper investigates the complex pseudospin dynamics in multimode polaritonic Josephson junctions, revealing how intermode interactions influence polarization oscillations and self-trapping phenomena.

Contribution

It introduces a Keldysh-Green function approach to analyze multimode polaritonic Josephson junctions considering pseudospin effects, a novel theoretical framework.

Findings

Polarization degree oscillates with renormalized frequency due to intermode interactions.

Intermode transfer influences Josephson tunneling and polarization dynamics.

Dynamical polarization separation occurs under certain conditions.

Abstract

We analyzed multimode Josephson junctions with exciton-polaritons (polaritonic Josephson junctions) when several coupling mechanisms of fundamental and excited states are present. The applied method is based on Keldysh-Green function formalism and takes into account polariton pseudospin. We found that mean value of circular polarization degree in intrinsic Josephson oscillations and microscopic quantum self-trapping follow an oscillator behavior whose renormalizes due to intermode interactions. The effect of an additional transfer of particles over junction barrier occurring in multimode approximation in combination with common Josephson tunneling is discussed in regime of dynamical separation of two polarizations.