We present a study for the dispersion relation and character of the excitations of a single- and two-component Bose-Einstein condensate (BEC). We study the single-component dispersion for a finite BEC system and look at examples of quasiparticles to understand and characterize the dispersion relation. Next we present the dispersion relation for a two-component BEC in both the miscible and immiscible parameter regimes. Then we present examples of the quasiparticles for both regimes.

• Received 11 March 2014

DOI:https://doi.org/10.1103/PhysRevA.89.053601