Nonequilibrium Josephson Oscillations in Bose-Einstein Condensates without Dissipation

Mauricio Trujillo-Martinez; Anna Posazhennikova; Johann Kroha

doi:10.1103/PhysRevLett.103.105302

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Nonequilibrium Josephson Oscillations in Bose-Einstein Condensates without Dissipation

Mauricio Trujillo-Martinez, Anna Posazhennikova, Johann Kroha

DOI 10.1103/PhysRevLett.103.105302 · Physical Review Letters

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Abstract

We perform a detailed quantum dynamical study of nonequilibrium Josephson oscillations between interacting Bose-Einstein condensates confined in a finite-size double-well trap. We find that the Josephson junction can sustain multiple undamped Josephson oscillations up to a characteristic time scale τc without quasipartcles being excited in the system. This may explain recent related experiments. Beyond a characteristic time scale τc the dynamics of the junction is governed by fast, quasiparticle-assisted Josephson tunneling as well as Rabi oscillations between the discrete quasiparticle levels. We predict that an initially self-trapped state of the Bose-Einstein condensates will be destroyed by these fast dynamics.