Condensate growth dynamics in a quantum-quenched super-saturated Bose gas

Details Condensate growth dynamics in a quantum-quenched super-saturated Bose gas Condensate growth dynamics in a quantum-quenched super-saturated Bose gas

2011-12-19

arxiv.org/abs/1112.4457v1

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

By quenching the strength of interactions in an atomic Bose gas just below the condensation temperature, we create a "super-saturated" vapor which has more thermal atoms than it can contain in equilibrium. Subsequently the number of condensed atoms ($N_0$) grows even though the temperature ($T$) rises and the total atom number decays. We show that the non-equilibrium evolution of the system is close to isoenergetic and reproduce the observed condensate growth within a simple theoretical model. We also observe a clear separation between $T$ and $N_0$ dynamics: while the global energy distribution evolves according to the classical relaxation picture, the condensate growth is generally slower and clearly reveals the importance of bosonic stimulation. These measurements explicitly demonstrate the theoretically expected "two-step" picture of condensate growth.

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