Nonequilibrium Josephson oscillations in Bose-Einstein condensates without dissipation.
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 tau(c) without quasipartcles being excited in the system. This may explain recent related experiments. Beyond a characteristic time scale tau(c) 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.
Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, Nussallee, 12, D-53115 Bonn, Germany.
Mauricio
M
Trujillo-Martinez
Anna
A
Posazhennikova
Johann
J
Kroha