Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2
TT 32.11: Talk
Thursday, March 25, 2010, 17:00–17:15, H18
Bose Josephson junction out of equilibrium — •Anna Posazhennikova1, Mauricio Trujillo-Martinez2, and Johann Kroha2 — 1Fachbereich Physik M703, Universitaet Konstanz, Konstanz, D-78457, Germany — 2Physikalisches Institut adn Bethe Center for Theoretical Physics, Universitaet Bonn, Nussallee 12, D-53115 Bonn, Germany
We perform a detailed quantum dynamical study of nonequilibrium Josephson oscillations between interacting Bose-Einstein condesates confined in a double-well trap. We find, that the Josephson junction can sustain multiple undamped Josephson oscillations up to a certain characteristic time-scale, without quasiparticles being excited in the system. This might explain recent experimental data. Beyond the characteristic time scale the dynamics of the Josephson junction is governed by fast, quasiparticle assited Josephson tunneling as well as Rabi oscillations between the descrete quasiparticle levels. We predict, that an initially self-trapped state of the Bose Josephson junction will be destroyed by these fast oscillations.