Dipole dynamics of an interacting bosonic mixture

Year: 2022

Authors: Cavicchioli L., Fort C., Modugno M., Minardi F., Burchianti A.

Autors Affiliation: Ist Nazl Ottica, CNR INO, I-50019 Sesto Fiorentino, Italy; Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Basque Country UPV EHU, Dept Phys, Bilbao 48080, Spain; Basque Fdn Sci, IKERBASQUE, Bilbao 48013, Spain; Univ Basque Country UPV EHU, EHU Quantum Ctr, Leioa 48940, Spain; Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy.

Abstract: We unravel the coupled dipole dynamics of a two-species Bose-Einstein condensate with tunable interspecies interaction. We produce a degenerate mixture of K-41 – Rb-87 in an optical trap and we study the dipole oscillations of both atomic species in the linear response regime. Varying the interspecies interaction from the weakly to the strongly attractive side, we measure the frequencies and the composition of the two dipole eigenmodes. For sufficiently strong interactions, even beyond the mean-field collapse, we find that the frequency of the low-energy eigenmode is determined only by the bare trap frequencies and the species population imbalance. The experimental results are well reproduced by numerical simulations based on two coupled Gross-Pitaevskii equations. Our findings provide a detailed picture of the dipole excitations in asymmetric bosonic mixtures.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 4 (4)      Pages from: 43068-1  to: 43068-7

More Information: We thank Chiara d’Errico for early contributions to the experiment and the Quantum Gases group at LENS for support. We acknowledge the technical assistance of Antonio Orlando and the members of the LENS electronic and mechanical workshops. This work was supported by MUR Infrastructural funding through CNR-PASQUA initiative. M.M. acknowledges support through Grant No. PGC2018-101355-B-I00 funded by MCIN/AEI/10.13039/501100011033 and by ERDF A way of making Europe, and from the Basque Government through Grant No. IT1470-22.
KeyWords: Collective Excitations; Bose; Oscillations
DOI: 10.1103/PhysRevResearch.4.043068

ImpactFactor: 4.200
Citations: 7
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