Dipole modes of a trapped bosonic mixture: Fate of the sum-rule approach

Abstract

We present a general discussion of the dipole modes of a heteronuclear bosonic mixture in a harmonic trap by comparing the prediction of the sum-rule approach with full Gross-Pitaevskii (GP) calculations. Yet in the range of interaction in which the mixture is miscible and stable at the mean field level, $g_{12}^2<g_{11}{g}_{22}$, we find that there are regimes where the sum rules displays significant deviations from the GP solution. We provide an interpretation for this behavior in terms of the Ehrenfest approach, which we show to be equivalent to the sum-rule approach for dipole excitations.

arXiv comment8 pages, 3 figures; improved text and other minor corrections

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Cited by in corpus (2)

• Dipole dynamics of an interacting bosonic mixture
• Probing supersolidity through excitations in a spin-orbit-coupled Bose-Einstein condensate