Properties of excitations in systems with a spinor Bose-Einstein condensate

TL;DR

This paper develops a theoretical framework for analyzing excitations in homogeneous spinor Bose-Einstein condensates, focusing on correlation functions, propagators, and mode damping, revealing differences between collective and one-particle spectra.

Contribution

It introduces a comprehensive theory for excitations in spinor BECs, including correlation functions and damping, highlighting differences between collective and single-particle spectra.

Findings

Collective and one-particle excitation spectra differ.

Damping of modes is characterized in the intermediate temperature range.

Correlation functions for density and spin fluctuations are derived.

Abstract

General theory in case of homogenous Bose-Einstein condensed systems with spinor condensate is presented for the correlation functions of density and spin fluctuations and for the one-particle propagators as well. The random phase approximation is investigated and the damping of the modes is given in the intermediate temperature region. It is shown that the collective and the one-particle excitation spectra do not coincide fully.