Spectral properties of coupled cavity arrays in one dimension

TL;DR

This paper investigates the spectral properties of one-dimensional coupled cavity arrays using the variational cluster approach, analyzing photons, atomic excitations, and polariton quasiparticles through spectral functions, densities of states, and correlations.

Contribution

It introduces a detailed analysis of polariton quasiparticles as wave vector and filling dependent combinations of photons and atomic excitations in coupled cavity arrays.

Findings

Spectral functions for photons and atomic-like excitations are computed.

Densities of states and momentum distributions are characterized.

Polariton quasiparticles are defined and their component weights analyzed.

Abstract

Spectral properties of coupled cavity arrays in one dimension are investigated by means of the variational cluster approach. Coupled cavity arrays consist of two distinct "particles," namely, photons and atomiclike excitations. Spectral functions are evaluated and discussed for both particle types. In addition, densities of states, momentum distributions and spatial correlation functions are presented. Based on this information, polariton "quasiparticles" are introduced as appropriate, wave vector and filling dependent linear combinations of photon and atomiclike particles. Spectral functions and densities of states are evaluated for the polariton quasiparticles, and the weights of their components are analyzed.