Quantum mechanics

Bose–Einstein condensate

Phase (matter)

Pure mathematics

Field (mathematics)

Bose gas

Statistical physics

Laser

Physics

Quantum entanglement

Mathematics

Condensed matter physics

Spinodal decomposition

Quantum

Mean field theory

Filamentation

Wavenumber

Thermalisation

Binary number

Arithmetic

New Journal of Physics

We explore the quench dynamics of a binary Bose-Einstein condensate crossing the miscibility-immiscibility threshold and vice versa, both within and in particular beyond the mean-field approximation. Increasing the interspecies repulsion leads to the filamentation of the density of each species, involving shorter wavenumbers and longer spatial scales in the many-body approach. These filaments appear to be strongly correlated and exhibit domain-wall structures. Following the reverse quench process multiple dark-antidark solitary waves are spontaneously generated and subsequently found to decay in the many-body scenario. We simulate single-shot images to connect our findings to possible experimental realizations. Finally, the growth rate of the variance of a sample of single-shots probes the degree of entanglement inherent in the system.

Correlation effects in the quench-induced phase separation dynamics of a two species ultracold quantum gas