Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas

D. J. Brown, A. V.H. McPhail, Donald Hylton White, D. Baillie, S. K. Ruddell, M. D. Hoogerland

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Abstract

We experimentally and numerically investigate thermalization processes of a trapped Rb87 Bose gas, initially prepared in a nonequilibrium state through partial Bragg diffraction of a Bose-Einstein condensate (BEC). The system evolves in a Gaussian potential, where we observe the destruction of the BEC due to collisions and subsequent growth of a new condensed fraction in an oscillating reference frame. Furthermore, we occasionally observe the presence of defects, which we identify as gray solitons. We simulate the evolution of our system using the truncated Wigner method and compare the outcomes with our experimental results.

Original languageEnglish
Article number013606
JournalPhysical Review A
Volume98
Issue number1
DOIs
Publication statusPublished - 2018 Jul 9

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Brown, D. J., McPhail, A. V. H., White, D. H., Baillie, D., Ruddell, S. K., & Hoogerland, M. D. (2018). Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas. Physical Review A, 98(1), [013606]. https://doi.org/10.1103/PhysRevA.98.013606