2011/12/27 by Clemens Neuenhahn, Anatoli Polkovnikov, Florian Marquardt · 1 citation
Physics and Astronomy · #Breather #Classical limit #Cold Atom Physics and Bose-Einstein Condensates #Coupling (piping) #Limit (mathematics) #Materials science #Nonlinear system #Phase (matter) #Physics #Quantum #Quantum electrodynamics #Quantum fluctuation #Quantum mechanics #Quantum, superfluid, helium dynamics #Semiclassical physics #Sine #Strong Light-Matter Interactions #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.109.085304
7 pages, 5 figures
arxiv created 2011/12/27 · openalex publication_date 2012/08/21 · arxiv updated 2013/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the relative phase between two weakly interacting 1D condensates of bosonic atoms after suddenly switching on the tunnel coupling. The following phase dynamics is governed by the quantum sine-Gordon equation. In the semiclassical limit of weak interactions, we observe the parametric amplification of quantum fluctuations leading to the formation of breathers with a finite lifetime. The typical lifetime and density of these "quasibreathers" are derived employing exact solutions of the classical sine-Gordon equation. Both depend on the initial relative phase between the condensates, which is considered as a tunable parameter.