Excitations and behavior of a trapped two component Bose Einstein Condensate

We present an analysis of the excitation spectrum for a two-component quasi-two-dimensional Bose-Einstein condensate (BEC). We study how excitations change character 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 further study the characteristic behavior of the gas across the miscible to immiscible phase transition.