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Crossing Over from Attractive to Repulsive Interactions in a Tunneling Bosonic Josephson Junction

  Articoli su Riviste JCR/ISI  (anno 2017)

Autori:  Spagnolli G., Semeghini G., Masi L., Ferioli G., Trenkwalder A., Coop S., Landini M., Pezzè L., Modugno G., Inguscio M., Smerzi A., Fattori M

Affiliazione Autori:  CNR Istituto Nazionale Ottica, 50019 Sesto Fiorentino, Italy; LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy; ICFO-Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain; Quantum Science and Technology in Arcetri, QSTAR, 50125 Firenze, Italy

Riassunto:  We explore the interplay between tunneling and interatomic interactions in the dynamics of a bosonic Josephson junction. We tune the scattering length of an atomic 39 K Bose-Einstein condensate confined in a double-well trap to investigate regimes inaccessible to other superconducting or superfluid systems. In the limit of small-amplitude oscillations, we study the transition from Rabi to plasma oscillations by crossing over from attractive to repulsive interatomic interactions. We observe a critical slowing down in the oscillation frequency by increasing the strength of an attractive interaction up to the point of a quantum phase transition. With sufficiently large initial oscillation amplitude and repulsive interactions, the system enters the macroscopic quantum self-trapping regime, where we observe coherent undamped oscillations with a self-sustained average imbalance of the relative well population. The exquisite agreement between theory and experiments enables the observation of a broad range of many body coherent dynamical regimes driven by tunable tunneling energy, interactions and external forces, with applications spanning from atomtronics to quantum metrology.

Volume n.:  118 (23)      Pagine da: 230403-1  a: 230403-6
Parole chiave: Josephson junction - Bose Einstein condensate - attractive interactions - plasma oscillations - self trapping
DOI: 10.1103/PhysRevLett.118.230403

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