Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction

Physical Review Letters
Marine PigneurJörg Schmiedmayer

Abstract

We present an experimental study on the nonequilibrium tunnel dynamics of two coupled one-dimensional Bose-Einstein quasicondensates deep in the Josephson regime. Josephson oscillations are initiated by splitting a single one-dimensional condensate and imprinting a relative phase between the superfluids. Regardless of the initial state and experimental parameters, the dynamics of the relative phase and atom number imbalance shows a relaxation to a phase-locked steady state. The latter is characterized by a high phase coherence and reduced fluctuations with respect to the initial state. We propose an empirical model based on the analogy with the anharmonic oscillator to describe the effect of various experimental parameters. A microscopic theory compatible with our observations is still missing.

References

Oct 21, 1996·Physical Review Letters·M Lewenstein, L You
Aug 11, 2005·Physical Review Letters·Michael AlbiezMarkus K Oberthaler
Apr 7, 2010·Physical Review Letters·Kaspar SakmannLorenz S Cederbaum
Mar 17, 2011·Physical Review Letters·L J LeBlancA Smerzi
Mar 19, 2013·Physical Review Letters·Emanuele G Dalla TorreAnatoli Polkovnikov
Jun 28, 2013·Nature Communications·T BerradaJ Schmiedmayer

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Citations

Sep 29, 2018·Physical Review Letters·I KukuljanG Takacs
Mar 13, 2021·Physical Review Letters·F BorselliJ Schmiedmayer

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