INO
CNR
vai_a_storia   vai_a_organizzazione   vai_a_sedi   vai_a_personale   Area Riservata
    English English Version  
 
 

Spin-dipole oscillation and relaxation of coherently coupled Bose-Einstein condensates

  Articoli su Riviste JCR/ISI  (anno 2015)

Autori:  Sartori A., Marino J., Stringari S., Recati A

Affiliazione Autori:  INO-CNR BEC Center and Dipartimento di Fisica, Universita` di Trento, 38123 Povo, Italy; Institute of Theoretical Physics, TU Dresden, D-01062 Dresden, Germany; Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany

Riassunto:  We study the static and the dynamic response of coherently coupled two component Bose-Einstein condensates due to a spin-dipole perturbation. The static dipole susceptibility is determined and is shown to be a key quantity to identify the second order ferromagnetic transition occurring at large inter-species interaction. The dynamics, which is obtained by quenching the spin-dipole perturbation, is very much affected by the system being paramagnetic or ferromagnetic and by the correlation between the motional and the internal degrees of freedom. In the paramagnetic phase the gas exhibits well defined out-of-phase dipole oscillations, whose frequency can be related to the susceptibility of the system using a sum rule approach. In particular in the interaction SU(2) symmetric case, i.e., all the two-body interactions are the same, the external dipole oscillation coincides with the internal Rabi flipping frequency. In the ferromagnetic case, where linear response theory in not applicable, the system shows highly non-linear dynamics. In particular we observe phenomena related to ground state selection: the gas, initially trapped in a domain wall configuration, reaches a final state corresponding to the magnetic ground state plus small density ripples. Interestingly, the time during which the gas is unable to escape from its initial configuration is found to be proportional to the square root of the wall surface tension.

Rivista/Giornale:  NEW JOURNAL OF PHYSICS
Volume n.:  17      Pagine da: 093036-1  a: 093036-11
Ulteriori informazioni:  AR acknowledges useful discussions with Marta Abad, Markus Heyl, Nicolas Pavloff and Wilhelm Zwerger, and support from the Alexander von Humboldt foundation. A.S. acknowledges Komet 337 group of their Johannes Gutenberg Universitat Mainz for their kind hospitality. This work has been supported by ERC through the QGBE grant and by Provincia Autonoma di Trento.
DOI: 10.1088/1367-2630/17/9/093036

*Impact Factor della Rivista: (2015) 3.570   *Citazioni: 11
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

Riferimenti visionabili in IsiWeb of Knowledge: (solo per sottoscrittori)
Per visualizzare la scheda dell'articolo su IsiWeb: Clicca qui
Per visualizzare la scheda delle Citazioni dell'articolo su IsiWeb: Clicca qui

INO © Istituto Nazionale di Ottica - Largo Fermi 6, 50125 Firenze | Tel. 05523081 Fax 0552337755 - P.IVA 02118311006     P.E.C.    Info