Crossing Over from Attractive to Repulsive Interactions in a Tunneling Bosonic Josephson Junction
| Autor: | Spagnolli, G., Semeghini, G., Masi, L., Ferioli, G., Trenkwalder, A., Coop, S., Landini, M., Pezze', L., Modugno, G., Inguscio, M., Smerzi, A., Fattori, M. |
|---|---|
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 118, 230403 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.118.230403 |
| Popis: | 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. Comment: 10 pages, 8 figures, supplemental materials are included |
| Databáze: | arXiv |
| Externí odkaz: |
|