Bose-condensate tunneling dynamics: Momentum-shortened pendulum with damping
Anno: 1999
Autori: Marino I., Raghavan S., Fantoni S., Shenoy S.R., Smerzi A.
Affiliazione autori: Abdus Salam Int Ctr Theoret Phys, I-34100 Trieste, Italy; Univ Rochester, Rochester Theory Ctr Opt Sci & Engn, Dept Phys & Astron, Rochester, NY 14627 USA; Ist Nazl Fis Mat, I-34014 Trieste, Italy; Scuola Int Super Studi Avanzati, I-34014 Trieste, Italy.
Abstract: Bose-Einstein condensates in a double-well trap, as well He-3-B baths connected by micropores, have been shown to exhibit Josephson-like tunneling phenomena. Unlike the superconductor Josephson junction of phase difference phi that maps onto a rigid pendulum of energy cos(phi), these systems map onto a momentum-shortened pendulum of energy -root 1-p(phi)(2)cos(phi) and length root 1-p(phi)(2), where p(phi) is a population imbalance between the wells/baths. We study here the effect of damping on the four distinct modes of the nonrigid pendulum, characterized by distinct temporal mean values, [phi] and [p(phi)]. Damping is shown to produce different decay trajectories to the final equilibrium phi=0=p(phi) state that are characteristic dynamic signatures of the initial oscillation modes. In particular, damping causes pi-state oscillations with [phi]=pi to increase in amplitude and pass through phase-slip states, before equilibrating. Similar behavior has been seen in He-3-B experiments. [S1050-2947(99)03207-2].
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 60 (1) Da Pagina: 487 A: 493
Parole chiavi: Einstein Condensation; Atoms; GasDOI: 10.1103/PhysRevA.60.487Citazioni: 87dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
