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.

Dual-species Bose-Einstein condensate of 41K and 87Rb in a hybrid trap

We report on the production of a 41K−87Rb dual-species Bose-Einstein condensate in a hybrid trap, consisting of a magnetic quadrupole and an optical dipole potential. After loading both atomic species in the trap, we cool down 87Rb first by magnetic and then by optical evaporation, while 41K is sympathetically cooled by elastic collisions with 87Rb. We eventually produce two-component condensates with more than 105 atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.

A. Burchianti, et al.
Dual-species Bose-Einstein condensate of 41K and 87Rb in a hybrid trap
Phys. Rev. A 98, 063616 (2018)

K/Rb people

Luca Cavicchioli
PhD student
Alessia Burchianti
Scientific staff
Chiara Fort
Scientific staff
Massimo Inguscio
Scientific staff
Francesco Minardi
Scientific staff
Former members:
Giovanni Barontini
Jacopo Catani
Stefano Conclave
Chiara D'Errico
Luigi De Sarlo
Giacomo Lamporesi
Paolo Maioli
Lorenzo Marconi
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