Nonlinear Phase Dynamics in a Driven Bosonic Josephson Junction

Erez Boukobza; Michael G. Moore; Doron Cohen; Amichay Vardi

doi:10.1103/PhysRevLett.104.240402

← Back to search

Nonlinear Phase Dynamics in a Driven Bosonic Josephson Junction

Erez Boukobza, Michael G. Moore, Doron Cohen, Amichay Vardi

DOI 10.1103/PhysRevLett.104.240402 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study the collective dynamics of a driven two-mode Bose-Hubbard model in the Josephson interaction regime. The classical phase space is mixed, with chaotic and regular components, which determine the dynamical nature of the fringe visibility. For a weak off-resonant drive, where the chaotic component is small, the many-body dynamics corresponds to that of a Kapitza pendulum, with the relative phase φ between the condensates playing the role of the pendulum angle. Using a master equation approach we show that the modulation of the intersite potential barrier stabilizes the φ=π “inverted pendulum” coherent state, and protects the fringe visibility.