Considering the hurdles of experiments with more than one atomic species, the temptation arises of rephrasing Arthur L. Schawlow: "Double-species Bose-Einstein condensates are condensates with one species too many". We think otherwise. Quantum mixtures allow the investigation of a wealth of genuinely quantum phenomena: mixed phases of superfluids and Mott insulators, impurities and polarons, chemistry at zero-temperature.

Quantum Droplets in a Heteronuclear Bose Mixture observed

We report on the formation of heteronuclear quantum droplets in an attractive bosonic mixture of 41K and 87Rb. We observe long-lived self-bound states, both in free space and in an optical waveguide. In the latter case, the dynamics under the effect of a species-dependent force confirms their bound nature. By tuning the interactions from the weakly to the strongly attractive regime, we study the transition from expanding to localized states, in both geometries. We compare the experimental results with numerical simulations and we find a good agreement in the full range of explored interactions.

C. D'Errico et al.
Observation of Quantum Droplets in a Heteronuclear Bosonic Mixture
Phys. Rev. Research 1, 033155 (2019)

K/Rb people

Lorenzo Marconi
Postdoctoral fellow
Alessia Burchianti
Scientific staff
Chiara D'Errico
Scientific staff
Chiara Fort
Scientific staff
Massimo Inguscio
Scientific staff
Francesco Minardi
Scientific staff
Former members:
Giovanni Barontini
Jacopo Catani
Stefano Conclave
Luigi De Sarlo
Giacomo Lamporesi
Paolo Maioli
Sara Rosi
Devang S. Naik
Gregor Thalhammer

K/Rb contacts

For further information, request of material, job opportunities, please contact:

Francesco Minardi
(minardi@lens.unifi.it)

K/Rb funding

EU Quantum Flagship
Qombs (2018-2021)
PRIN2010-2011
EU FP7 EQuaM
  Fondazione Cassa di Risparmio Firenze
SUPERACI (2018-2020)
  Progetto Premiale 2013 ABnanotech