Journal
EUROPEAN PHYSICAL JOURNAL D
Volume 67, Issue 12, Pages -Publisher
SPRINGER
DOI: 10.1140/epjd/e2013-40635-x
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Funding
- ERC through the QGBE grant
- Provincia Autonoma di Trento
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We study the collective modes of the minority component of a highly unbalanced Bose-Bose mixture. In the miscible case the minority component feels an effective external potential and we derive an analytical expression for the mode frequencies. The latter is independent of the minority component interaction strength. In the immiscible case we find that the ground state can be a two-domain walls soliton. Although the mode frequencies are continuous at the transition, their behaviour is very different with respect to the miscible case. The dynamical behaviour of the solitonic structure and the frequency dependence on the inter- and intra-species interaction is numerically studied using coupled Gross-Pitaevskii equations.
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