Emergence of a new pair-coherent phase in many-body quenches of repulsive bosons

Abstract

We investigate the dynamical mode population statistics and associated first- and second-order coherence of an interacting bosonic two-mode model when the pair-exchange coupling is quenched from negative to positive values. It is shown that for moderately rapid second-order transitions, a new pair-coherent phase emerges on the positive coupling side in an excited state, which is not fragmented as the ground-state single-particle density matrix would prescribe it to be.

arXiv comment4 pages of RevTex4-1, 4 figures; Rapid Communication in Physical Review A

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• Many-site coherence revivals in the extended Bose-Hubbard model and the Gutzwiller approximation
• Robustness of fragmented condensate many-body states for continuous distribution amplitudes in Fock space
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• Nonadiabatic multichannel dynamics of a spin-orbit coupled condensate
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