Non-equilibrium dynamics of fluctuations in an ultra-cold atomic mixture

Abstract

We investigate an ultra-cold mixture of Bose gases interacting via spin-changing collisions by studying the dynamics of spin fluctuations. The experimental implementation employs ${}^{23}$Na and ${}^7$Li atoms, which are prepared out of equilibrium across a wide range of initial conditions. We identify three regimes in the dynamics of the system for different initial states: a long-lived metastable regime, an instability range with strong growth of fluctuations, and a fast relaxing regime approaching thermal equilibrium. Theoretical modelling of the data allows us to reconstruct effective potentials which characterize the different dynamical regimes of the system.

9 pages, 5 figures

References in corpus (6)

• Probing many-body dynamics on a 51-atom quantum simulator
• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Critical Dynamics of Spontaneous Symmetry Breaking in a Homogeneous Bose gas
• Thermalization dynamics of a gauge theory on a quantum simulator
• Dynamical phase transitions in the collisionless pre-thermal states of isolated quantum systems: theory and experiments
• Coherent heteronuclear spin dynamics in an ultracold spin-1 mixture