A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions

Year: 2020

Authors: Burchianti A., D’Errico C., Prevedelli M., Salasnich L., Ancilotto F., Modugno M., Minardi F., Fort C.

Autors Affiliation: CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy; Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35131 Padua, Italy; Univ Padua, CNISM, I-35131 Padua, Italy; CNR IOM Democritos, I-26534136 Trieste, Italy; Univ Basque Country, UPV EHU, Dept Fis Teor & Hist Ciencia, E-48080 Bilbao, Spain; Ikerbasque, Basque Fdn Sci, Bilbao 48013, Spain; CNR, Ist Protez Sostenibile Piante, I-10135 Turin, Italy.

Abstract: We report on the production of a 41K-87Rb dual-species Bose–Einstein condensate with tunable interspecies interaction and we study the mixture in the attractive regime; i.e., for negative values of the interspecies scattering length a12. The binary condensate is prepared in the ground state and confined in a pure optical trap. We exploit Feshbach resonances for tuning the value of a12 . After compensating the gravitational sag between the two species with a magnetic field gradient, we drive the mixture into the attractive regime. We let the system evolve both in free space and in an optical waveguide. In both geometries, for strong attractive interactions, we observe the formation of self-bound states, recognizable as quantum droplets. Our findings prove that robust, long-lived droplet states can be realized in attractive two-species mixtures, despite the two atomic components possibly experiencing different potentials.

Journal/Review: CONDENSED MATTER

Volume: 5 (1)      Pages from: 21-1  to: 21-15

More Information: This research was funded by the European Commission through FET Flagship on Quantum Technologies-Qombs Project (grant number 820419) and by Fondazione Cassa di Risparmio Firenze through project “SUPERACI-Superfluid Atomic Circuits.” M.M. acknowledges support from the Spanish Ministry of Science, Innovation and Universities and the European Regional Development Fund FEDER through grant number PGC2018-101355-B-I00 (MCIU/AEI/FEDER, UE), and the Basque Government through grant number IT986-16.
KeyWords: Multicomponent Suerfluids, Mixtures of quantum gases
DOI: 10.3390/condmat5010021

Citations: 31
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