Excitations of a trapped two component Bose Einstein Condensate

TL;DR

This paper analyzes the excitation spectrum of a two-component quasi-2D Bose-Einstein Condensate, focusing on changes across the phase transition and the nature of bulk and interface excitations.

Contribution

It provides a detailed analysis of how excitation modes evolve during the miscible to immiscible phase transition in a two-component BEC.

Findings

Bulk excitations resemble single-component BEC modes

Interface bending excitations are present at the phase boundary

Excitation characteristics vary with interaction strength

Abstract

We present analysis of the excitation spectrum for a 2 component quasi2D Bose Einstein Condensate. We study how the character of the excitations change across the miscible to immiscible phase transition. We find that the bulk excitations are typical of a single-component BEC with the addition of interface bending excitations. We study how these excitations change as a function of the interaction strength.